Fix unclosed HTML comment in Sphinx template.

Author: tseaver

docs/_templates/layout.html

@@ -101,7 +101,7 @@ <h1 class="page-title">Python</h1>
             <a href="versions.html" class="v-btn">
               <img src="_static/images/icon-arrow-bullet.svg" />
               See version History
-            </a href="versions.html">
+            </a>-->
           </div><!-- end of .versions -->
       </header>