Media Galleries: Fix a formatting error in the html doc.

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

 <h2 id="usage">Usage</h2>
 
 <p>The mediaGalleries API lets you prompt the user for permission to access
 media galleries on the user's computer. The permission dialog contains common
 media locations for the platform and allows the user to specify additional
 locations. From those locations, only media files will be present in the file
 system objects.</p>
 
 <h2 id="manifest">Manifest</h2>
 
@@ skipping 26 matching lines @@
     <tr>
       <td>"allAutoDetected"</td>
       <td>
         Grants your app access to all auto-detected media galleries on the
         user's computer. This permission causes an install-time prompt to be
         displayed indicating that the app will have access to the user's media
         files.
       </td>
     </tr>
     <tr>
-      <td rowspan="2">Access&nbsp;type</td>
+      <td rowspan="3">Access&nbsp;type</td>
       <td>"read"</td>
       <td>Grants your app the right to read files in media galleries.</td>
     </tr>
     <tr>
       <td>"delete"</td>
       <td>
         Grants your app the right to delete files from media galleries.
         "read" permission is a prerequisite for "delete". Specify both "read"
         and "delete" to obtain both types of permissions to media galleries.
       </td>
@@ skipping 53 matching lines @@
 <p>If present, the user's iTunes library can be accessed as a media gallery.
 In addition to the media files in the library, the "iTunes Music Library.xml"
 file is also presented. Regardless of where the music files are actually on the
 disk (and where the xml file says they are), they are mapping into an
 Artist/Album/Track hierarchy like iTunes does by default.  This mapping doesn't
 always work perfectly, so there are two things to note for Apps trying to match
 the xml file with files in the gallery. If the filenames for tracks within an
 album are not unique, they will be uniquified by adding the track id in
 parentheses before the extension, and if there is a colon or a slash in the
 artist, album, or track name, they are turned into underscore characters.</p>