diff --git a/core/java/android/os/Build.java b/core/java/android/os/Build.java
index bde3327..018bb2c 100755
--- a/core/java/android/os/Build.java
+++ b/core/java/android/os/Build.java
@@ -135,8 +135,8 @@
      *
      * <p>Starting with API level 29, persistent device identifiers are guarded behind additional
      * restrictions, and apps are recommended to use resettable identifiers (see <a
-     * href="c"> Best practices for unique identifiers</a>). This method can be invoked if one of
-     * the following requirements is met:
+     * href="/training/articles/user-data-ids">Best practices for unique identifiers</a>). This
+     * method can be invoked if one of the following requirements is met:
      * <ul>
      *     <li>If the calling app has been granted the READ_PRIVILEGED_PHONE_STATE permission; this
      *     is a privileged permission that can only be granted to apps preloaded on the device.
diff --git a/telephony/java/android/telephony/TelephonyManager.java b/telephony/java/android/telephony/TelephonyManager.java
index 8ae1ee9..3d51d7c 100644
--- a/telephony/java/android/telephony/TelephonyManager.java
+++ b/telephony/java/android/telephony/TelephonyManager.java
@@ -1888,8 +1888,8 @@
      *
      * <p>Starting with API level 29, persistent device identifiers are guarded behind additional
      * restrictions, and apps are recommended to use resettable identifiers (see <a
-     * href="c"> Best practices for unique identifiers</a>). This method can be invoked if one of
-     * the following requirements is met:
+     * href="/training/articles/user-data-ids">Best practices for unique identifiers</a>). This
+     * method can be invoked if one of the following requirements is met:
      * <ul>
      *     <li>If the calling app has been granted the READ_PRIVILEGED_PHONE_STATE permission; this
      *     is a privileged permission that can only be granted to apps preloaded on the device.
@@ -1941,8 +1941,8 @@
      *
      * <p>Starting with API level 29, persistent device identifiers are guarded behind additional
      * restrictions, and apps are recommended to use resettable identifiers (see <a
-     * href="c"> Best practices for unique identifiers</a>). This method can be invoked if one of
-     * the following requirements is met:
+     * href="/training/articles/user-data-ids">Best practices for unique identifiers</a>). This
+     * method can be invoked if one of the following requirements is met:
      * <ul>
      *     <li>If the calling app has been granted the READ_PRIVILEGED_PHONE_STATE permission; this
      *     is a privileged permission that can only be granted to apps preloaded on the device.
@@ -2010,8 +2010,8 @@
      *
      * <p>Starting with API level 29, persistent device identifiers are guarded behind additional
      * restrictions, and apps are recommended to use resettable identifiers (see <a
-     * href="c"> Best practices for unique identifiers</a>). This method can be invoked if one of
-     * the following requirements is met:
+     * href="/training/articles/user-data-ids">Best practices for unique identifiers</a>). This
+     * method can be invoked if one of the following requirements is met:
      * <ul>
      *     <li>If the calling app has been granted the READ_PRIVILEGED_PHONE_STATE permission; this
      *     is a privileged permission that can only be granted to apps preloaded on the device.
@@ -2088,8 +2088,8 @@
      *
      * <p>Starting with API level 29, persistent device identifiers are guarded behind additional
      * restrictions, and apps are recommended to use resettable identifiers (see <a
-     * href="c"> Best practices for unique identifiers</a>). This method can be invoked if one of
-     * the following requirements is met:
+     * href="/training/articles/user-data-ids">Best practices for unique identifiers</a>). This
+     * method can be invoked if one of the following requirements is met:
      * <ul>
      *     <li>If the calling app has been granted the READ_PRIVILEGED_PHONE_STATE permission; this
      *     is a privileged permission that can only be granted to apps preloaded on the device.
@@ -2126,8 +2126,8 @@
      *
      * <p>Starting with API level 29, persistent device identifiers are guarded behind additional
      * restrictions, and apps are recommended to use resettable identifiers (see <a
-     * href="c"> Best practices for unique identifiers</a>). This method can be invoked if one of
-     * the following requirements is met:
+     * href="/training/articles/user-data-ids">Best practices for unique identifiers</a>). This
+     * method can be invoked if one of the following requirements is met:
      * <ul>
      *     <li>If the calling app has been granted the READ_PRIVILEGED_PHONE_STATE permission; this
      *     is a privileged permission that can only be granted to apps preloaded on the device.
@@ -2210,8 +2210,8 @@
      *
      * <p>Starting with API level 29, persistent device identifiers are guarded behind additional
      * restrictions, and apps are recommended to use resettable identifiers (see <a
-     * href="c"> Best practices for unique identifiers</a>). This method can be invoked if one of
-     * the following requirements is met:
+     * href="/training/articles/user-data-ids">Best practices for unique identifiers</a>). This
+     * method can be invoked if one of the following requirements is met:
      * <ul>
      *     <li>If the calling app has been granted the READ_PRIVILEGED_PHONE_STATE permission; this
      *     is a privileged permission that can only be granted to apps preloaded on the device.
@@ -2247,8 +2247,8 @@
      *
      * <p>Starting with API level 29, persistent device identifiers are guarded behind additional
      * restrictions, and apps are recommended to use resettable identifiers (see <a
-     * href="c"> Best practices for unique identifiers</a>). This method can be invoked if one of
-     * the following requirements is met:
+     * href="/training/articles/user-data-ids">Best practices for unique identifiers</a>). This
+     * method can be invoked if one of the following requirements is met:
      * <ul>
      *     <li>If the calling app has been granted the READ_PRIVILEGED_PHONE_STATE permission; this
      *     is a privileged permission that can only be granted to apps preloaded on the device.
@@ -3853,8 +3853,8 @@
      *
      * <p>Starting with API level 29, persistent device identifiers are guarded behind additional
      * restrictions, and apps are recommended to use resettable identifiers (see <a
-     * href="c"> Best practices for unique identifiers</a>). This method can be invoked if one of
-     * the following requirements is met:
+     * href="/training/articles/user-data-ids">Best practices for unique identifiers</a>). This
+     * method can be invoked if one of the following requirements is met:
      * <ul>
      *     <li>If the calling app has been granted the READ_PRIVILEGED_PHONE_STATE permission; this
      *     is a privileged permission that can only be granted to apps preloaded on the device.
@@ -3891,8 +3891,8 @@
      *
      * <p>Starting with API level 29, persistent device identifiers are guarded behind additional
      * restrictions, and apps are recommended to use resettable identifiers (see <a
-     * href="c"> Best practices for unique identifiers</a>). This method can be invoked if one of
-     * the following requirements is met:
+     * href="/training/articles/user-data-ids">Best practices for unique identifiers</a>). This
+     * method can be invoked if one of the following requirements is met:
      * <ul>
      *     <li>If the calling app has been granted the READ_PRIVILEGED_PHONE_STATE permission; this
      *     is a privileged permission that can only be granted to apps preloaded on the device.
@@ -4145,8 +4145,8 @@
      *
      * <p>Starting with API level 29, persistent device identifiers are guarded behind additional
      * restrictions, and apps are recommended to use resettable identifiers (see <a
-     * href="c"> Best practices for unique identifiers</a>). This method can be invoked if one of
-     * the following requirements is met:
+     * href="/training/articles/user-data-ids">Best practices for unique identifiers</a>). This
+     * method can be invoked if one of the following requirements is met:
      * <ul>
      *     <li>If the calling app has been granted the READ_PRIVILEGED_PHONE_STATE permission; this
      *     is a privileged permission that can only be granted to apps preloaded on the device.
@@ -4184,8 +4184,8 @@
      *
      * <p>Starting with API level 29, persistent device identifiers are guarded behind additional
      * restrictions, and apps are recommended to use resettable identifiers (see <a
-     * href="c"> Best practices for unique identifiers</a>). This method can be invoked if one of
-     * the following requirements is met:
+     * href="/training/articles/user-data-ids">Best practices for unique identifiers</a>). This
+     * method can be invoked if one of the following requirements is met:
      * <ul>
      *     <li>If the calling app has been granted the READ_PRIVILEGED_PHONE_STATE permission; this
      *     is a privileged permission that can only be granted to apps preloaded on the device.