Added link to shorcuts in the notebook menu.

IPython/html/templates/notebook.html

@@ -198,6 +198,7 b' class="notebook_app"'
                 <li><a href="http://ipython.org/documentation.html" target="_blank">IPython Help</a></li>
                 <li><a href="http://ipython.org/ipython-doc/stable/interactive/notebook.html" target="_blank">Notebook Help</a></li>
                 <li id="keyboard_shortcuts" title="Opens a tooltip with all keyboard shortcuts"><a href="#">Keyboard Shortcuts</a></li>
+                <li><a href="http://ipython.org/ipython-doc/dev/interactive/cm_keyboard.html" target="_blank">Editor Shortcuts</a></li>
                 <li class="divider"></li>
                 <li><a href="http://docs.python.org" target="_blank">Python</a></li>
                 <li><a href="http://docs.scipy.org/doc/numpy/reference/" target="_blank">NumPy</a></li>