update link in LAMMPS theme for Sphinx

doc/utils/sphinx-config/_themes/lammps_theme/breadcrumbs.html

@@ -18,7 +18,7 @@
             <a href="{{ pathto('_sources/' + sourcename, true)|e }}" rel="nofollow"> View page source</a>
           {% endif %}
             <a href="http://lammps.sandia.gov">Website</a>
-            <a href="Section_commands.html#comm">Commands</a>
+            <a href="Commands_all.html">Commands</a>
         {% endif %}
       </li>
   </ul>