docs: update access form to short URL (#11)

* docs: update access form to short URL Updating the link to point to shortened form, so if there are any changes in the future, we won't need to update the README again.

Author: SujayKrishna

README.rst

@@ -12,7 +12,7 @@ and answer service for BigQuery data.
 .. warning::
  Data QnA is currently in private Alpha. Access is only available to
  allowlisted users. Apply for access
- `here <https://docs.google.com/forms/d/e/1FAIpQLSc4Vszsmm6LrPT1MoNbC074SYCMBXB8tps6OEmdmg9zBgo3TA/viewform>`_.
+ `here <http://g.co/cloud/data-qna>`_.
 
 .. |alpha| image:: https://img.shields.io/badge/support-alpha-orange.svg
  :target: https://github.com/googleapis/google-cloud-python/blob/master/README.rst#alpha-support