Doc: Several fixes and improvements for 3.9 whatsnew #16375
Merged
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The motivation behind this PR was seeing multiple broken links within https://docs.python.org/3.9/whatsnew/3.9.html (including in my own recent addition). It can be a bit tricky to get the Sphinx roles exactly right. While fixing the broken Sphinx roles, I also added a few new ones and made a few minor grammar fixes.
To verify that the Sphinx roles were fixed and that the new ones were correct, I compared https://docs.python.org/3.9/whatsnew/3.9.html to a local copy created from
make html
within the PR branch.