removed the session mutex for improved performance

docs/python_binding.html

@@ -126,6 +126,8 @@ a list of entries.</p>
 <li>torrent_handle::get_download_queue</li>
 <li>torrent_handle::piece_availability</li>
 </ul>
+<p><tt class="docutils literal"><span class="pre">create_torrent::add_node()</span></tt> takes two arguments, one string and one integer,
+instead of a pair. The string is the address and the integer is the port.</p>
 <p>For an example python program, see <tt class="docutils literal"><span class="pre">client.py</span></tt> in the <tt class="docutils literal"><span class="pre">bindings/python</span></tt>
 directory.</p>
 <p>A very simple example usage of the module would be something like this:</p>