Add better example to docs

Author: ebidel

google-maps-api.html

@@ -61,12 +61,12 @@
     clientId: null,
 
     /**
-     * The libraries to load with this api. Defaults to "places", but an example
-     * value might be, "places,geometry"
-     * see developers.google.com/maps/documentation/javascript/libraries
+     * The libraries to load with this map. Defaults to "places". For more information
+     * see https://developers.google.com/maps/documentation/javascript/libraries.
      *
      * @attribute libraries
      * @type string
+     * @default "places"
      */
     libraries: "places",