Tidy up the docstring for ``icalendar.prop.vPeriod``

[stevepiercy]

See preview:

https://icalendar--746.org.readthedocs.build/en/746/api.html#icalendar.prop.vPeriod

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📚 Documentation preview 📚: https://icalendar--746.org.readthedocs.build/

[coveralls]

Pull Request Test Coverage Report for Build 11972144061

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 96.075%

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Totals
Change from base Build 11971956834:	0.0%
Covered Lines:	4538
Relevant Lines:	4715

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💛 - Coveralls

[stevepiercy]

I just reformatted all the docstrings. It was a total mess. Now it is legible as HTML.

However, we should consider adopting a docstring standard, and document that adoption. I recommend Google docstring, as describe in this post:

https://stackoverflow.com/a/24385103/2214933

[niccokunzmann]

Hi that looks good!