tweak #13453 Firefox bug summary

docs/browser-bugs.html

@@ -25,7 +25,7 @@ lead: "A list of the browser bugs that Bootstrap is currently grappling with."
       <tbody>
         <tr>
           <td>Firefox</td>
-          <td><code>.table-bordered</code> with an empty <code>&lt;tbody&gt;</code> elements show no borders at all</td>
+          <td><code>.table-bordered</code> with an empty <code>&lt;tbody&gt;</code> is missing borders</td>
           <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>