Removed usage of deprecated switch_to_*() selenium methods.
Improved patching of sys.stdout in refs #23078.
Silenced OptionParser deprecation warning in a test.
Silenced a Python 2 ImportWarning in a migrations test.
Corrected headings in migration docs.
Silenced test warning for deprecated IPAddressField.
Fixed #23094 -- Removed redundant argument in select_related() example.

Thanks thegeekofalltrades at gmail.com for the report.
Fixed #21707 -- Added helpful error message when using {{ block.super }} in base template.

Thanks mitar for the suggestion.
Fixed #23014 -- Infinite migration regression with unique/index_together.
Fixed #22849 -- Added Session.__str__()
Forward ported release notes for refs #23089.