Updating package README's with more useful doc links.

Also removing duplicate "Homepage" links (duplicate of
"API Documentation" links).

Author: dhermes

packages/google-cloud-vision/README.rst

@@ -5,11 +5,9 @@ Python Client for Google Cloud Vision
 
 .. _Google Cloud Vision: https://cloud.google.com/vision/
 
--  `Homepage`_
--  `API Documentation`_
+-  `Documentation`_
 
-.. _Homepage: https://googlecloudplatform.github.io/google-cloud-python/
-.. _API Documentation: http://googlecloudplatform.github.io/google-cloud-python/
+.. _Documentation: https://googlecloudplatform.github.io/google-cloud-python/stable/vision-usage.html
 
 Quick Start
 -----------