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

Author: chenyumic

samples/metricscaler/README.rst

@@ -16,7 +16,7 @@ to scale Cloud Bigtable based on CPU usage.
 .. _Stackdriver Monitoring: http://cloud.google.com/monitoring/docs/
 
 
-.. _Google Cloud Bigtable: https://cloud.google.com/bigtable/docs/ 
+.. _Google Cloud Bigtable: https://cloud.google.com/bigtable/docs/
 
 Setup
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@@ -63,7 +63,7 @@ Metricscaling 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/metricscaler/metricscaler.py;bigtable/metricscaler/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/metricscaler/metricscaler.py,bigtable/metricscaler/README.rst