Fix error in documentation -- SIGQUIT not SIGINT will make Bazel dump…

… its threads!

Fixes #748

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MOS_MIGRATED_REVID=111468883

site/docs/bazel-user-manual.html

@@ -3752,8 +3752,8 @@ <h2 id='profiling'>Troubleshooting performance by profiling</h2>
   </ul></li>
 </ul>
 
-<p>If Bazel appears to be hung, you can hit <kbd>&langle;Control&rangle;</kbd>-<kbd>\</kbd> or send Bazel
-  a <code>SIGINT</code> signal (<code>kill -3 $(bazel info server_pid)</code>) to get a
+<p>If Bazel appears to be hung, you can hit <kbd><kbd>ctrl</kbd> + <kbd>\</kbd></kbd> or send
+  Bazel a <code>SIGQUIT</code> signal (<code>kill -3 $(bazel info server_pid)</code>) to get a
   thread dump in the file <code>$(bazel info output_base)/server/jvm.out</code>.
 </p>