Merge 159156 - Extensions Docs Server: Fix headings with no IDs

chrome/common/extensions/docs/templates/articles/i18n-messages.html

 <h1>Formats: Locale-Specific Messages</h1>
 
 
 <p>
 Each internationalized extension has at least one
 file named <code>messages.json</code>
 that provides locale-specific strings for the extension.
 This page describes the format of <code>messages.json</code> files.
 For information on how to internationalize and localize your extension,
 see the <a href="i18n.html">Internationalization</a> page.
@@ skipping 58 matching lines @@
       "user": {
         "content": "$1",
         "example": "Cira"
       }
     }
   }
 }
 </pre>
 
 
-<h2>Field details</h2>
+<h2 id="field_details">Field details</h2>
 
 <p>
 This section describes each field
 that can appear in a <code>messages.json</code> file.
 For details on how the messages file is used &mdash;
 for example, what happens when a locale doesn't define
 all the messages &mdash;
 see <a href="i18n.html">Internationalization</a>.
 </p>
 
@@ skipping 230 matching lines @@
 <pre>
 "placeholders": {
   "our_site": {
     "content": "Example.com",
   },
   "user": {
     "content": "$1",
     "example": "Cira"
   }
 }
-</pre>
+</pre>