Update language to comply with Android's inclusive language guidance

See https://source.android.com/setup/contribute/respectful-code for reference

For this round, the fixes are only applied to the following to minimize breaking dependencies:
  * comments (excluding javaDoc annotations)
	* private constants
	* private functions
	* parameters within functions

BYPASS_INCLUSIVE_LANGUAGE_REASON=Just updating a few select inclusive language violations.
No-Typo-Check: Changes focused on inclusive language violations.
BUG: 295342157
Change-Id: If7774f1617bf62c0ae8841b30934281a4b87e0e3
diff --git a/media/tests/MediaRouter/src/com/android/mediaroutertest/MediaRouter2ManagerTest.java b/media/tests/MediaRouter/src/com/android/mediaroutertest/MediaRouter2ManagerTest.java
index 4086dec..7f4a4fe 100644
--- a/media/tests/MediaRouter/src/com/android/mediaroutertest/MediaRouter2ManagerTest.java
+++ b/media/tests/MediaRouter/src/com/android/mediaroutertest/MediaRouter2ManagerTest.java
@@ -872,7 +872,7 @@
         CountDownLatch addedLatch = new CountDownLatch(1);
         CountDownLatch preferenceLatch = new CountDownLatch(1);
 
-        // A dummy callback is required to send route feature info.
+        // A placeholder callback is required to send route feature info.
         RouteCallback routeCallback = new RouteCallback() {};
         MediaRouter2Manager.Callback managerCallback = new MediaRouter2Manager.Callback() {
             @Override