docs: update README to break infinite redirect loop (#1450)

Author: dandhlee

README.rst

@@ -29,7 +29,7 @@ Google APIs Client Libraries, in `Client Libraries Explained`_.
 .. |versions| image:: https://img.shields.io/pypi/pyversions/google-cloud-storage.svg
    :target: https://pypi.org/project/google-cloud-storage/
 .. _Google Cloud Storage: https://cloud.google.com/storage
-.. _Client Library Documentation: https://cloud.google.com/python/docs/reference/storage/latest
+.. _Client Library Documentation: https://cloud.google.com/python/docs/reference/storage/latest/summary_overview
 .. _Product Documentation:  https://cloud.google.com/storage
 .. _CHANGELOG:  https://github.com/googleapis/python-storage/blob/main/CHANGELOG.md
 .. _github.com/googleapis/python-storage: https://github.com/googleapis/python-storage