Adding dev documentation for chrome.location

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

Index: chrome/common/extensions/docs/templates/intros/location.html
diff --git a/chrome/common/extensions/docs/templates/intros/location.html b/chrome/common/extensions/docs/templates/intros/location.html
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+<p id="classSummary">

[Jeffrey Yasskin, 2013/07/27 03:00:29]

Does this id do anything visible in the UI? Would it make more sense to head
this section with an <h2 id="classSummary"> (or "overview" like some other
APIs)?

[vadimt, 2013/07/30 01:58:41]

Done.

+  To create a location watch, call $ref:location.watchLocation passing in

[Andy, 2013/07/30 00:56:06]

Before you explain how to create a location watch, it would be helpful to
provide a little context: What is a location watch and when would you use one?

[vadimt, 2013/07/30 01:58:41]

Done.

+  the location watch details via the <code>requestInfo</code> parameter:
+</p>
+
+<pre>chrome.location.watchLocation(name, requestInfo);</pre>
+<p>
+  You'll also need to add a listener

[Andy, 2013/07/30 00:56:06]

Suggestion: "You'll also" --> "You also"

[vadimt, 2013/07/30 01:58:41]

Done.

+  to its <code>onChanged</code> event.

[Andy, 2013/07/30 00:56:06]

What does "its" refer to here?

[vadimt, 2013/07/30 01:58:41]

Done.

+  Chrome will fire this event after you create your location watch. After this,
+  it will keep firing the event every time the geographical location of your
+  computer changes until you call $ref:location.clearWatch.

[Andy, 2013/07/30 00:56:06]

Suggestion: "the geographical location of your computer" --> "the geographic
location of the host machine"

[vadimt, 2013/07/30 01:58:41]

Done.

+</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>