Kernel and Help menu tooltips

IPython/html/templates/notebook.html

@@ -168,15 +168,19 b' class="notebook_app"'
         </li>
         <li class="dropdown"><a href="#" class="dropdown-toggle" data-toggle="dropdown">Kernel</a>
             <ul class="dropdown-menu">
-                <li id="int_kernel"><a href="#">Interrupt</a></li>
-                <li id="restart_kernel"><a href="#">Restart</a></li>
+                <li id="int_kernel"
+                    title="Send KeyboardInterrupt (CTRL-C) to the Kernel">
+                    <a href="#">Interrupt</a></li>
+                <li id="restart_kernel"
+                    title="Restart the Kernel">
+                    <a href="#">Restart</a></li>
             </ul>
         </li>
         <li class="dropdown"><a href="#" class="dropdown-toggle" data-toggle="dropdown">Help</a>
-            <ul class="dropdown-menu">
+            <ul class="dropdown-menu" title="Opens in a new window">
                 <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"><a href="#">Keyboard Shortcuts</a></li>
+                <li id="keyboard_shortcuts" title="Opens a tooltip with all keyboard shortcuts"><a href="#">Keyboard 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>