Merge "Add doc to getNetworkCapabilities" am: 59d89299c9

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1690668

Change-Id: I81c764ca04e3a300272ba18faa35d9fb0ecb54b1
diff --git a/framework/src/android/net/ConnectivityManager.java b/framework/src/android/net/ConnectivityManager.java
index 3e2fbea..19764dd 100644
--- a/framework/src/android/net/ConnectivityManager.java
+++ b/framework/src/android/net/ConnectivityManager.java
@@ -1561,7 +1561,7 @@
 
     /**
      * Get the {@link NetworkCapabilities} for the given {@link Network}.  This
-     * will return {@code null} if the network is unknown.
+     * will return {@code null} if the network is unknown or if the |network| argument is null.
      *
      * This will remove any location sensitive data in {@link TransportInfo} embedded in
      * {@link NetworkCapabilities#getTransportInfo()}. Some transport info instances like