Pydocstyle fixes

Jenkins pydocstyle unit test is currently disabled by `|| true` in Jenkinsfile pipeline. Add docstrings and remove `|| true`.

Look at the Jenkinsfile to find where pydocstyle is run with `|| true`. Run pydocstyle on the codebase to see which modules are missing docstrings. Add appropriate docstrings to those modules, then remove the `|| true` from the Jenkinsfile and verify the pipeline passes.

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