Regenerate the README files and fix the Open in Cloud Shell link for some samples [(#1441)](GoogleCloudPlatform/python-docs-samples#1441)

Author: chenyumic

samples/hello_happybase/README.rst

@@ -19,7 +19,7 @@ interact with Cloud Bigtable.
 .. _HappyBase API: http://happybase.readthedocs.io/en/stable/
 
 
-.. _Google Cloud Bigtable: https://cloud.google.com/bigtable/docs 
+.. _Google Cloud Bigtable: https://cloud.google.com/bigtable/docs
 
 Setup
 -------------------------------------------------------------------------------
@@ -66,7 +66,7 @@ Basic example
 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 
 .. image:: https://gstatic.com/cloudssh/images/open-btn.png
-   :target: https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/GoogleCloudPlatform/python-docs-samples&page=editor&open_in_editor=bigtable/hello_happybase/main.py;bigtable/hello_happybase/README.rst
+   :target: https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/GoogleCloudPlatform/python-docs-samples&page=editor&open_in_editor=bigtable/hello_happybase/main.py,bigtable/hello_happybase/README.rst