Merge pull request #6222 from seadowg/offline-maps-delete

Make sure delete is mentioned in offline maps blurb

strings/src/main/res/values/strings.xml

@@ -489,7 +489,7 @@
     <string name="offline_layer_dialog_title">Select offline layer</string>
 
     <!-- Description of how to add offline layers to the project -->
-    <string name="offline_layer_dialog_description">Select the offline layer to use for all maps in this project. You can add options to the list by selecting an MBTile file from your device.</string>
+    <string name="offline_layer_dialog_description">Select the offline layer to use for all maps in this project. You can add options to the list by selecting an MBTiles file from your device and also delete existing layers from the list.</string>
 
     <!-- Text of button user can press to get help when setting up Offline Layers -->
     <string name="get_help_with_offline_layers">Learn more about adding MBTiles.</string>