feat: Google docstrings Returns section can be parsed with or without multiple items

[AntoineD]

BTW, make format is failing on my machine:

❯ make format
bash: line 1: duty: command not found
make: *** [format] Error 127

[AntoineD]

The ci quality job fails just like on the main branch and make check on my machine.

[pawamoy]

Yes, that's expected until I release a new version of mkdocstrings-python that supports latest Griffe 🙂

BTW, make format is failing on my machine:

Have you installed dependencies with make setup? Make you don't have an unrelated venv activated.

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Thanks for the PR! I will try to review it soon.