Some cleanups for Tethering

Bug: 126481523
Test: -build, flash, boot
      -FrameworksNetTests

Change-Id: I904646efa87eb5434124c7828aca4ab09c5dc38e
diff --git a/core/java/android/net/ConnectivityManager.java b/core/java/android/net/ConnectivityManager.java
index 4a64128..8e287dd 100644
--- a/core/java/android/net/ConnectivityManager.java
+++ b/core/java/android/net/ConnectivityManager.java
@@ -2617,7 +2617,7 @@
 
     /**
      * Start listening to tethering change events. Any new added callback will receive the last
-     * tethering status right away. If callback is registered when tethering loses its upstream or
+     * tethering status right away. If callback is registered when tethering has no upstream or
      * disabled, {@link OnTetheringEventCallback#onUpstreamChanged} will immediately be called
      * with a null argument. The same callback object cannot be registered twice.
      *