Add WebKit bug for #9774 to Wall of Browser Bugs

[skip sauce]

docs/browser-bugs.html

@@ -109,8 +109,8 @@ lead: "A list of the browser bugs that Bootstrap is currently grappling with."
         </tr>
         <tr>
           <td>Safari</td>
-          <td>Justified nav rendering bug</td>
-          <td>(No public bug tracker)</td>
+          <td><code>display: table-cell;</code> within media query renders incorrectly when resizing the window</td>
+          <td><a href="https://bugs.webkit.org/show_bug.cgi?id=138167">WebKit bug #138167</a></td>
           <td><a href="https://github.com/twbs/bootstrap/issues/9774">#9774</a></td>
         </tr>
         <tr>