Fix docs build after switch to CorePlatformApi

Fix docs build after switching the build to use CorePlatformApi
stubs. Apparently previously it was fine to link to classes not
in the public API / CorePlatformApi, but it's not any more.

Bug: 117831958
Test: m docs
Test: generate_android_icu4j.sh
Change-Id: I5944e4f1cd277b8f8e96d35d56e63ed93fdc54ea
diff --git a/android_icu4j/src/main/java/android/icu/text/NumberFormat.java b/android_icu4j/src/main/java/android/icu/text/NumberFormat.java
index 8ea86f4..f0e13bb 100644
--- a/android_icu4j/src/main/java/android/icu/text/NumberFormat.java
+++ b/android_icu4j/src/main/java/android/icu/text/NumberFormat.java
@@ -39,7 +39,7 @@
  *
  * <p>
  * <strong>IMPORTANT:</strong> New users are strongly encouraged to see if
- * {@link NumberFormatter} fits their use case.  Although not deprecated, this
+ * {@code NumberFormatter} fits their use case.  Although not deprecated, this
  * class, NumberFormat, is only provided for java.text.NumberFormat compatibility.
  * <hr>
  *
diff --git a/tools/srcgen/javadoc_patches/patches/src/main/java/android/icu/text/NumberFormat.java.patch b/tools/srcgen/javadoc_patches/patches/src/main/java/android/icu/text/NumberFormat.java.patch
index d9b3b71..207b66c 100644
--- a/tools/srcgen/javadoc_patches/patches/src/main/java/android/icu/text/NumberFormat.java.patch
+++ b/tools/srcgen/javadoc_patches/patches/src/main/java/android/icu/text/NumberFormat.java.patch
@@ -1,5 +1,14 @@
---- android_icu4j/src/main/java/android/icu/text/NumberFormat.java	2018-08-21 18:04:14.310638137 +0100
-+++ android_icu4j/src/main/java/android/icu/text/NumberFormat.java	2018-08-21 18:00:48.769641569 +0100
+--- android_icu4j/src/main/java/android/icu/text/NumberFormat.java	2018-10-19 11:01:09.353895065 +0100
++++ android_icu4j/src/main/java/android/icu/text/NumberFormat.java	2018-10-19 11:01:28.681998885 +0100
+@@ -39,7 +39,7 @@
+  *
+  * <p>
+  * <strong>IMPORTANT:</strong> New users are strongly encouraged to see if
+- * {@link NumberFormatter} fits their use case.  Although not deprecated, this
++ * {@code NumberFormatter} fits their use case.  Although not deprecated, this
+  * class, NumberFormat, is only provided for java.text.NumberFormat compatibility.
+  * <hr>
+  *
 @@ -551,9 +551,6 @@
      //============== Locale Stuff =====================
  
@@ -200,7 +209,7 @@
       * <strong>[icu]</strong> Returns a scientific format for the specified locale.
       * @return a scientific number format
       */
-@@ -1316,9 +1256,6 @@
+@@ -1318,9 +1258,6 @@
  
  
      /**