Extensions Docs Server: Fix headings with no IDs

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

 <h1>Known Issues</h1>
 
 <p>Chrome's support for packaged apps is under active development and rapidly
 evolving, so there are still a few rough edges. Here's a list of known issues
 in the current <a href="https://tools.google.com/dlpage/chromesxs/">Chrome
 Canary</a>:</p>
 
 <p id="known-issues"></p>
 <p id="known-issues-error" style="position: absolute; top: -1000px; color: #333; padding: 1em; background: #eee;">
   The list of known issues cannot be loaded at this time. You may be able to
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 <p>
 If one of the above describes an issue you've run into, and you wish to be
 updated when it's resolved, click the star icon on the page header. Do not
 respond to the bug to say "me too" or ask "when will this be fixed?"; such
 updates can cause hundreds of emails to be sent. Add a comment only if you have
 information (such as a better test case or a suggested fix) that is likely
 to be helpful.
 </p>
 
-<h2>Can't find it in the list?</h2>
+<h2 id="cant_find_it">Can't find it in the list?</h2>
 
 <p>
   If none of the issues listed above describe what you're running into, you
   may wish to <a href="http://code.google.com/p/chromium/issues/list?can=2&q=Feature%3DApps+Type%3DBug">search</a>
   the bug tracker, in case it has been reported but not marked as being known
   yet.
 </p>
 
 <p>
   If you still can't find something that matches the problem you're having, you
   can <a href="https://code.google.com/p/chromium/issues/entry?template=Defect report from user&labels=Feature-Apps,Type-Bug,Area-Internals,Pri-2">report
   the bug</a> on the Chromium bug tracker. Please include as many details as
   possible in your bug report, including Chrome version number, operating
   system, and any other relevant configuration details. Bug reports that attach
   a small app that exhibits the problem are especially appreciated.
-</p>
+</p>