typos in importing.rst
Importing Altair
================
-As of Altair 2.0, we are including support for multiple version of both
+As of Altair 2.0, we include support for multiple versions of both
Vega-Lite (1.x and 2.x) and Vega (2.x and 3.x) in a single Python package.
-This section of the documentation describe how you can import the different
+This section of the documentation describes how you can import the different
versions of the Python APIs.
.. note::
