Add tooltips for functions in home

_includes/bin_table.html

@@ -3,7 +3,7 @@
         {% for function_pair in site.data.functions %}
         {% assign function_id = function_pair[0] %}
         {% assign function = function_pair[1] %}
-        <li><a href="#+{{ function.label | downcase }}">{{ function.label }}</a></li>
+        <li><a href="#+{{ function.label | downcase }}" data-title="{{ function.description | replace: '\n', ' ' }}">{{ function.label }}</a></li>
         {% endfor %}
     </ul>