[CM] Fix comments, add tests to TransportInfo API

Bug: 117605977
Test: atest NetworkCapabilitiesTest
Change-Id: I734ec56e44cd09d11ae81a856a53a26e1191b9a0
diff --git a/core/java/android/net/NetworkCapabilities.java b/core/java/android/net/NetworkCapabilities.java
index 0c44a56..8a5f43d 100644
--- a/core/java/android/net/NetworkCapabilities.java
+++ b/core/java/android/net/NetworkCapabilities.java
@@ -931,7 +931,7 @@
      * Returns a transport-specific information container. The application may cast this
      * container to a concrete sub-class based on its knowledge of the network request. The
      * application should be able to deal with a {@code null} return value or an invalid case,
-     * e.g. use {@code instanceof} operation to verify expected type.
+     * e.g. use {@code instanceof} operator to verify expected type.
      *
      * @return A concrete implementation of the {@link TransportInfo} class or null if not
      * available for the network.