Add an editme button at the bottom

docs/_layouts/page.html

@@ -63,6 +63,14 @@ layout: default
         {% endif %}
     </div>
 
+    {% if site.github_editme_path %}
+        This documentation is written in markdown. If there is something missing or can be improved, edit this page on github and create a PR:
+        {% unless page.editmepath == false %}
+        <a target="_blank" href="https://github.com/{{site.github_editme_path}}{{editmepath}}" class="btn btn-default githubEditButton" role="button"><i class="fa fa-github fa-lg"></i> Edit me</a>
+        {% endunless %}
+    {% endif %}
+
+
 {% include disqus.html %}
 
 </div>

docs/pages/pmd/devdocs/building.md

@@ -84,9 +84,6 @@ Now the source and binary distribution zip files can be found in the folder `pmd
 
 **Notes:**
 
-*   The rules that have already been written are specified in the `src/main/resources/rulesets/` directories of
-the specific languages, e.g. `pmd-java/src/main/resources/rulesets`.
-They’re also in the jar file that’s included with both the source and binary distributions.
-
-A paucity of detail, I’m sure you’d agree. If you think this document can be improved,
-please post [here](http://sourceforge.net/p/pmd/discussion/188192) and let me know how. Thanks!
+-   The rules that have already been written are specified in the `src/main/resources/rulesets/` directories of
+    the specific languages, e.g. `pmd-java/src/main/resources/rulesets`.
+    They’re also in the jar file that’s included with both the source and binary distributions.