Update documentation

topics/contributing/index.html

@@ -529,7 +529,7 @@ pip install -r requirements-test.txt
 <p>To build the documentation, install MkDocs with <code>pip install mkdocs</code> and then run the following command.</p>
 <pre><code>mkdocs build
 </code></pre>
-<p>This will build the html output into the <code>html</code> directory.</p>
+<p>This will build the documentation into the <code>site</code> directory.</p>
 <p>You can build the documentation and open a preview in a browser window by using the <code>serve</code> command.</p>
 <pre><code>mkdocs serve
 </code></pre>