docs: conform docstrings to PEP257 #48

Job	Run time
Lint the package	33s
Python: 3.7-x64 on ubuntu-latest	29s
Build the documentation	25s
Validate coverage	28s
Python: 3.7-x64 on windows-latest	1m 7s
Python: 3.7-x86 on windows-latest	47s
Python: 3.8-x64 on ubuntu-latest	26s
Python: 3.8-x64 on windows-latest	40s
Python: 3.8-x86 on windows-latest	1m 3s
Python: 3.9-x64 on ubuntu-latest	19s
Python: 3.9-x64 on windows-latest	51s
Python: 3.9-x86 on windows-latest	1m 1s
Python: 3.10-x64 on ubuntu-latest	32s
Python: 3.10-x64 on windows-latest	59s
Python: 3.10-x86 on windows-latest	1m 26s
Python: 3.11-x64 on ubuntu-latest	16s
Python: 3.11-x64 on windows-latest	52s
Python: 3.11-x86 on windows-latest	1m 8s
Python: 3.12-x64 on ubuntu-latest	27s
Python: 3.12-x64 on windows-latest	46s
Python: 3.12-x86 on windows-latest	1m 8s
Python: pypy-3.8-x64 on ubuntu-latest	52s
Python: pypy-3.8-x64 on windows-latest	2m 13s
Python: pypy-3.8-x86 on windows-latest	1m 46s
	20m 34s

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