Update language to comply with Android's inclusive language guidance

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

Bug: 161896447
Test: robotest & manual
Change-Id: Ibe64a68d7bddf84780dfac33555c097ff55c97a8

src/com/android/settings/utils/ContentCaptureUtils.java

@@ -45,7 +45,7 @@ public final class ContentCaptureUtils {
 
     public static boolean isFeatureAvailable() {
         // We cannot look for ContentCaptureManager, because it's not available if the service
-        // didn't whitelist Settings
+        // didn't allowlist Settings
         IBinder service = ServiceManager.checkService(Context.CONTENT_CAPTURE_MANAGER_SERVICE);
         return service != null;
     }