Adding dev documentation for chrome.location

chrome/common/extensions/docs/templates/intros/location.html

+<h2 id="overview">Overview</h2>
+<p>
+  To start retrieving the location, you need to create a location watch by

[Andy, 2013/07/30 20:26:14]

"the location" --> "location information"

[vadimt, 2013/08/01 00:02:02]

Done.

+  calling $ref:location.watchLocation, passing in
+  the location watch details via the <code>requestInfo</code> parameter:
+</p>
+
+<pre>chrome.location.watchLocation(name, requestInfo);</pre>
+<p>
+  You also need to add a listener
+  to $ref:location.onLocationUpdate event.

[Andy, 2013/07/30 20:26:14]

"to" --> "for the"

[vadimt, 2013/08/01 00:02:02]

Done.

+  Chrome will fire this event after you create your location watch. After this,

[Andy, 2013/07/30 20:26:14]

It's not clear what "this" refers to in "After this".  One idea:

"Chrome will fire this event after you create your location watch, and it will
keep firing..."

[vadimt, 2013/08/01 00:02:02]

Done.

+  it will keep firing the event every time the geographic
+  location of the host machine changes, until you call $ref:location.clearWatch.
+</p>
+<p>
+  Here's sample code
+  to listen for location updates:
+</p>
+<pre>
+  chrome.location.onLocationUpdate.addListener(function(position) {
+    console.log(JSON.stringify(position));
+  });
+</pre>