Fixed missing-yield-type-doc ignoring type annotation

[AWhetter]

Steps

• [*] Add yourself to CONTRIBUTORS if you are a new contributor.
• [*] Add a ChangeLog entry describing what your PR does.
• [*] If it's a new feature or an important bug fix, add a What's New entry in doc/whatsnew/<current release.rst>.
• [*] Write a good description on what the PR does.

Description

This fixes missing-yield-type-doc getting raised on a generator that has a type annotation and does not document a yield type. Returns documentation already caters for this case and so do parameters. Yields were missed out.

I've also removed a duplicate test.

Type of Changes

	Type
✓	🐛 Bug fix
	✨ New feature
	🔨 Refactoring
	📜 Docs

Related Issue

Closes #3185

[coveralls]

Coverage decreased (-0.03%) to 89.659% when pulling 61b5ae4 on AWhetter:fix_3185 into 6df0b3e on PyCQA:master.

[coveralls]

Coverage decreased (-0.03%) to 89.659% when pulling 61b5ae4 on AWhetter:fix_3185 into 6df0b3e on PyCQA:master.

[coveralls]

Coverage decreased (-0.03%) to 89.659% when pulling 61b5ae4 on AWhetter:fix_3185 into 6df0b3e on PyCQA:master.

[coveralls]

Coverage increased (+0.01%) to 89.701% when pulling d06c2d8 on AWhetter:fix_3185 into 6df0b3e on PyCQA:master.

[PCManticore]

Thanks, I cherry-picked it to 2.4 as well.