Add regendoc runs for fixture docs

[matthewhughes934]

• Fix various typos in fixture docs

• Add basic emaillib for tests in fixture.rst

  This will be used to power regendoc runs for later tests

• Add regendoc runs for emaillib tests in fixture

  Also update these tests ensure they pass.

  This addresses Use regendoc in fixture.rst #8213

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I've run regendoc locally to ensure the added tests pass, but the resulting diff was rather large (and included some bad whitespace) so I've left it out. What might be best here? I was thinking of just commiting the results of the added tests.

[bluetech]

The changes look good to me!

[nicoddemus]

LGTM, thanks a lot @matthewhughes934!

I've run regendoc locally to ensure the added tests pass, but the resulting diff was rather large (and included some bad whitespace) so I've left it out. What might be best here? I was thinking of just commiting the results of the added tests.

I'm surprise there were many changes... did you run on Linux using Python 3.8?

[matthewhughes934]

I'm surprise there were many changes... did you run on Linux using Python 3.8?

Ah, I was running on 3.9. Diff is reasonable after a run on 3.8: 10dd3db

[nicoddemus]

Awesome, thanks a lot!

Normally we squash the commits before merging, but I noticed you have some commits with !fixup... would you like to rebase the history yourself before we merge, or can I go ahead and hit Squash here on GitHub?

[matthewhughes934]

Awesome, thanks a lot!

Normally we squash the commits before merging, but I noticed you have some commits with !fixup... would you like to rebase the history yourself before we merge, or can I go ahead and hit Squash here on GitHub?

👍 rebased