more precise description of browser bug

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>Allow use of line-height for <code>&lt;input&gt;</code></td>
+          <td>Allow use of line-height for <code>&lt;input&gt;</code>-based buttons</td>
           <td><a href="https://bugzilla.mozilla.org/show_bug.cgi?id=697451">Mozilla bug #697451</a></td>
           <td><a href="https://github.com/twbs/bootstrap/issues/2985">#2985</a></td>
         </tr>