AOSP/Contacts - Update language to comply with Android's inclusive language guidance.

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

BUG=161896447

Test: by doing a make.
Change-Id: I9ded0e19cc0478dd54fb65ce273361446f6f0c82
diff --git a/src/com/android/contacts/ContactPhotoManager.java b/src/com/android/contacts/ContactPhotoManager.java
index e5f808d..1468ed7 100644
--- a/src/com/android/contacts/ContactPhotoManager.java
+++ b/src/com/android/contacts/ContactPhotoManager.java
@@ -602,8 +602,8 @@
     private static final String[] COLUMNS = new String[] { Photo._ID, Photo.PHOTO };
 
     /**
-     * Dummy object used to indicate that a bitmap for a given key could not be stored in the
-     * cache.
+     * Placeholder object used to indicate that a bitmap for a given key could not
+     * be stored in the cache.
      */
     private static final BitmapHolder BITMAP_UNAVAILABLE;