Fix building docs on Python 3.

Review Request #11992 — Created Jan. 24, 2022 and submitted — Latest diff uploaded

Information

Djblets
release-2.x

Reviewers

The Djblets documentation can now be built with Python 3, providing
better compatibility with our documentation hosting.

This mostly involves changing the version used to invoke Sphinx,
fixing a couple syntax errors (Unicode string prefixes), and removing
the hard-coded python in the Makefiles.

The copyright for the release notes has also been fixed to include
"2009-<now>", and an old reference to "Christian Hammond" as an author
was changed to "Beanbag, Inc."

Successfully built all the documentation.

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