Asorted docs fixed (#36672)

This PR includes:
- A fix to untemplated {{ plugin_type }} in docs
- Remove the additional info on how to edit module docs (see #36667)
- Add missing delimiter

docs/docsite/_themes/sphinx_rtd_theme/footer.html

@@ -22,7 +22,7 @@
 </script>
 
   <p>
-  Copyright © 2017 Red Hat, Inc.
+  Copyright © 2018 Red Hat, Inc.
   <br>
 
   {%- if last_updated %}
@@ -30,6 +30,6 @@
   {%- endif %}
   </p>
 <p>
-Ansible docs are generated from <a href="https://github.com/ansible/ansible">GitHub sources</a> using <a href="http://sphinx-doc.org/">Sphinx</a> using a theme provided by <a href="http://readthedocs.org">Read the Docs</a>. {% if pagename.endswith("_module") %}Module documentation is not edited directly, but is generated from the source code for the modules.  To submit an update to module docs, edit the 'DOCUMENTATION' metadata in the <a href="https://github.com/ansible/ansible/tree/devel/lib/ansible/modules">modules directory</a> of the <a href="https://github.com/ansible/ansible/">core source code repository</a>. {% endif %}
+Ansible docs are generated from <a href="https://github.com/ansible/ansible">GitHub sources</a> using <a href="http://sphinx-doc.org/">Sphinx</a> using a theme provided by <a href="http://readthedocs.org">Read the Docs</a>.
 </p>
 </footer>