Update `output_format` for markdown rendering.

Review Request #12119 — Created March 8, 2022 and submitted — Latest diff uploaded

Information

Review Board
release-5.0.x

Reviewers

The old xhtml1 output format is no longer actually supported inside
python-markdown. The two supported values are html and xhtml. This
change updates us to use those where appropriate.

Ran unit tests.

Commits

Files