Fix typo in Figure.vbar_stack docstring
@@ -723,7 +723,7 @@ Examples:
Examples:
Assuming a ``ColumnDataSource`` named ``source`` with columns
- *2106* and *2017*, then the following call to ``vbar_stack`` will
+ *2016* and *2017*, then the following call to ``vbar_stack`` will
will create two ``VBar`` renderers that stack:
.. code-block:: python
