Remove #8702 entry from Wall of browser bugs

A fix is shipping in Firefox 35: https://bugzilla.mozilla.org/show_bug.cgi?id=763671

docs/browser-bugs.html

@@ -41,12 +41,6 @@ lead: "A list of the browser bugs that Bootstrap is currently grappling with."
           <td><a href="https://bugzilla.mozilla.org/show_bug.cgi?id=1023761">Mozilla bug #1023761</a></td>
           <td><a href="https://github.com/twbs/bootstrap/issues/13453">#13453</a></td>
         </tr>
-        <tr>
-          <td>Firefox</td>
-          <td>Unusual default form control styles on Android</td>
-          <td><a href="https://bugzilla.mozilla.org/show_bug.cgi?id=900871">Closed Mozilla bug #900871</a>, <a href="https://bugzilla.mozilla.org/show_bug.cgi?id=763671">Open Mozilla bug #763671</a></td>
-          <td><a href="https://github.com/twbs/bootstrap/issues/8702">#8702</a></td>
-        </tr>
         <tr>
           <td>Firefox</td>
           <td><code>max-width: 100%;</code> doesn't work inside tables</td>