py_version doc fixes

[sage-maker]

Issue #, if available: #3318

Description of changes: Documentation changes for py_version

Testing done:

Merge Checklist

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General

• I have read the CONTRIBUTING doc
• I certify that the changes I am introducing will be backward compatible, and I have discussed concerns about this, if any, with the Python SDK team
• I used the commit message format described in CONTRIBUTING
• I have passed the region in to all S3 and STS clients that I've initialized as part of this change.
• I have updated any necessary documentation, including READMEs and API docs (if appropriate)

Tests

• I have added tests that prove my fix is effective or that my feature works (if appropriate)
• I have added unit and/or integration tests as appropriate to ensure backward compatibility of the changes
• I have checked that my tests are not configured for a specific region or account (if appropriate)
• I have used unique_name_from_base to create resource names in integ tests (if appropriate)
• If adding any dependency in requirements.txt files, I have spell checked and ensured they exist in PyPi

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.56%. Comparing base (8a559ad) to head (0299688).
Report is 119 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5048      +/-   ##
==========================================
- Coverage   86.56%   86.56%   -0.01%     
==========================================
  Files         440      440              
  Lines       42835    42834       -1     
==========================================
- Hits        37080    37079       -1     
  Misses       5755     5755              

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