Add context to "Play" string to clarify brand reference

issue 21295852

Change-Id: I1b8b019e056eb901be1c8dba1dc7f7d0c91fe952
diff --git a/ShamuLayout/res/values/strings.xml b/ShamuLayout/res/values/strings.xml
index 62aa571..c554ec4 100644
--- a/ShamuLayout/res/values/strings.xml
+++ b/ShamuLayout/res/values/strings.xml
@@ -18,6 +18,5 @@
     <string name="app_label">Nexus 6 Home Screen</string>
     <string name="google_folder_title">Google</string>
     <string name="create_folder_title">Create</string>
-    <!--Play here refers to the brand -->
-    <string name="play_folder_title">Play</string>
+    <string name="play_folder_title" desc="Play is short for Google Play here">Play</string>
 </resources>