docs: fix readme link (#58)

Release-As: 2.0.0

Author: busunkim96

packages/google-cloud-datacatalog/README.rst

@@ -88,8 +88,8 @@ Next Steps
    API to see other available methods on the client.
 -  Read the `Google Cloud Data Catalog API Product documentation`_ to learn
    more about the product and see How-to Guides.
--  View this `repository’s main README`_ to see the full list of Cloud
+-  View this `README`_ to see the full list of Cloud
    APIs that we cover.
 
 .. _Google Cloud Data Catalog API Product documentation:  https://cloud.google.com/data-catalog
-.. _repository’s main README: https://github.com/googleapis/google-cloud-python/blob/master/README.rst
+.. _README: https://github.com/googleapis/google-cloud-python/blob/master/README.rst