Merge pull request openlayers#1488 from ahocevar/google-api

Encourage the use of a Google API key

Author: ahocevar

examples/google.html

@@ -24,11 +24,12 @@ <h1 id="title">Google (v3) Layer Example</h1>
             <p><input id="animate" type="checkbox" checked="checked">Animated
                 zoom (if supported by GMaps on your device)</input></p>
             <p>
-                If you use the Google Maps v3 API with a Google layer, you don't
-                need to include an API key.  This layer only works in the 
-                spherical mercator projection.  See the 
-                <a href="google.js" target="_blank">google.js source</a> 
-                to see how this is done.
+                Google is encouraging the use of keys for Google Maps APIs as
+                described here: <a href="https://developers.google.com/maps/documentation/javascript/get-api-key">https://developers.google.com/maps/documentation/javascript/get-api-key</a>.
+                Once you have included the Google Maps script in your html,
+                refer to the
+                <a href="google.js" target="_blank">google.js source</a>
+                to see how to use Google Maps as layer in OpenLayers.
             </p>
         </div>
     </body>