Update grid title

Mock: https://screenshot.googleplex.com/7bunAcVgUa96mt8.png
Screenshot: https://screenshot.googleplex.com/7D8L2bfEcvbHja9.png

Bug: 184128735
Test: Manual
Change-Id: Icb2ceb6ecce0d0119d890542b2d4461d58ff0e74
diff --git a/res/values/strings.xml b/res/values/strings.xml
index 929bd4e..305f6fc 100755
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -28,7 +28,7 @@
 
     <!-- Title of a section of the customization picker where the user can select a Grid size for
         the home screen. [CHAR LIMIT=15] -->
-    <string name="grid_title">Grid</string>
+    <string name="grid_title">App grid</string>
 
     <!-- Label for a button that allows the user to apply the currently selected Theme.
         [CHAR LIMIT=20] -->