Update javadoc to use complete sentence

Avoid using the "iff" abbreviation in our Javadoc.

Bug: 158092978
Test: m doc-comment-check-docs and check the generated doc
Merged-In: I41bf8a6ddad200f00524d9b2dd1bf169810ee460
Change-Id: I41bf8a6ddad200f00524d9b2dd1bf169810ee460
diff --git a/core/java/android/net/NetworkRequest.java b/core/java/android/net/NetworkRequest.java
index a6bd74a..473e6c5 100644
--- a/core/java/android/net/NetworkRequest.java
+++ b/core/java/android/net/NetworkRequest.java
@@ -468,8 +468,8 @@
     }
 
     /**
-     * Returns true iff. the capabilities requested in this NetworkRequest are satisfied by the
-     * provided {@link NetworkCapabilities}.
+     * Returns true if and only if the capabilities requested in this NetworkRequest are satisfied
+     * by the provided {@link NetworkCapabilities}.
      *
      * @param nc Capabilities that should satisfy this NetworkRequest. null capabilities do not
      *           satisfy any request.