[docs] [issue33722] Document builtins in mock_open

[Jay Crotts]

Jay Crotts <crotts.jay at gmail.com> added the comment:

Yeah the PR had been stale for a while, and I re-based my fork without closing the PR, so when I pushed it to the fork it updated the PR reviewer list. Silly mistake by me, I should have made sure the diff wasn't huge before pushing it. I know review time is valuable and did not mean to waste it.

If you think it is a worthwhile change I'm happy to start over with another PR.

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<https://bugs.python.org/issue33722>
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