Document restrictions on integers in the version.

chrome/common/extensions/docs/static/manifest.html

 <div id="pageData-title" class="pageData">Formats: Manifest Files</div>
 <div id="pageData-showTOC" class="pageData">true</div>
 
 <p>
 Every extension has a
 <a href="http://www.json.org">JSON</a>-formatted manifest file,
 named <code>manifest.json</code>,
 that provides important information about the extension.
 </p>
 
@@ skipping 124 matching lines @@
 <a href="windows.html">Windows</a>,
 <a href="tabs.html">Tabs</a>, and
 <a href="bookmarks.html">Bookmarks</a>.
 </p>
 
 <h3 id="version">version</h3>
 
 <p>
 One to four dot-separated integers
 identifying the version of this extension.
-Examples:
+A couple of rules apply to the integers:
+they must be between 0 and 65535, inclusive,
+and non-zero integers can't start with 0.
+For example, 99999 and 032 are both invalid.
+</p>
+
+<p>
+Here are some examples of valid versions:
 </p>
 
 <ul>
   <li> <code>"version": "1"</code> </li>
   <li> <code>"version": "1.0"</code> </li>
   <li> <code>"version": "2.10.2"</code> </li>
   <li> <code>"version": "3.1.2.4567"</code> </li>
 </ul>
 
 <p>
 The autoupdate system compares versions
 to determine whether an installed extension
 needs to be updated.
 If the published extension has a newer version string
 than the installed extension,
 then the extension is automatically updated.
 </p>
 
 <p>
 The comparison starts with the leftmost integers.
 If those integers are equal,
 the integers to the right are compared,
 and so on.
-For example, 1.2.0 is a newer version than 1.1.9.99999.
+For example, 1.2.0 is a newer version than 1.1.9.9999.
 </p>
 
 <p>
 A missing integer is equal to zero.
-For example, 1.1.9.99999 is newer than 1.1.
+For example, 1.1.9.9999 is newer than 1.1.
 </p>
 
 <p>
 For more information, see
 <a href="autoupdate.html">Autoupdating</a>.
 </p>
 
 <p class="comment">
 [PENDING: Once the gallery is published, point to it
 and make a big deal of the fact that autoupdating is free
 if you use the gallery.]
 </p>