Fix some typos, broken links and other issues in extension docs

chrome/common/extensions/docs/templates/articles/faq.html

Index: chrome/common/extensions/docs/templates/articles/faq.html
===================================================================
--- chrome/common/extensions/docs/templates/articles/faq.html	(revision 181647)
+++ chrome/common/extensions/docs/templates/articles/faq.html	(working copy)
@@ -77,8 +77,8 @@
   <img src="{{static}}/images/hotdogmenu.png" height="29" width="29" alt=""
     class="nomargin" />
   and select <b>Extensions</b> from the <b>Tools</b> menu.
-  If there's a "+" next to "Developer mode",
-  click the "+" so it turns into a "-".
+  Ensure that the "Developer mode" checkbox in the top right-hand corner
+  is checked.
   Now you can reload extensions,
   load an unpacked directory of files as if it were a packaged extension,
   and more. For a complete tutorial, see
@@ -230,7 +230,7 @@
 <p>
   Yes, since extensions are built just like websites, they can use
   <a href="http://www.google.com/analytics/">Google Analytics</a> to track
-  usage.  However, we strongly advise you to modify the tracking code to pull
+  usage.  However, you have to modify the tracking code to pull

[Mike West, 2013/02/11 08:21:53]

Please change "have" to "must" for clarity.

[方觉(Fang Jue), 2013/02/11 11:37:54]

Done.

   an HTTPS version of the Google Analytics library.  See
   <a href="tut_analytics.html">this tutorial</a> for more information on doing
   this.