message: Add a comment to the new method I added yesterday.
  GitOrigin-RevId:
diff: @@ -57,6 +57,9 @@ public final class CleartextKeysetHandle {
  return KeysetHandle.fromKeyset(reader.read());
  }
  + /**
  + * @return the keyset underlying this {@code keysetHandle}.
  + */
  public static Keyset getKeyset(KeysetHandle keysetHandle) {
  return keysetHandle.getKeyset();
  }
  