docs: conform docstrings to PEP257 #36

Job	Run time
Validate coverage	36s
Build the documentation	26s
Python: 3.7-x64 on ubuntu-latest	23s
Lint the package	19s
Python: 3.7-x64 on windows-latest	14s
Python: 3.7-x86 on windows-latest	10s
Python: 3.7-x64 on macos-latest	11s
Python: 3.8-x64 on ubuntu-latest	1s
Python: 3.8-x64 on windows-latest	1s
Python: 3.8-x86 on windows-latest	1s
Python: 3.8-x64 on macos-latest	10s
Python: 3.9-x64 on ubuntu-latest	1s
Python: 3.9-x64 on windows-latest	1s
Python: 3.9-x86 on windows-latest	1s
Python: 3.9-x64 on macos-latest	1s
Python: 3.10-x64 on ubuntu-latest	20s
Python: 3.10-x64 on windows-latest	18s
Python: 3.10-x86 on windows-latest	13s
Python: 3.10-x64 on macos-latest	16s
Python: 3.11-x64 on ubuntu-latest	17s
Python: 3.11-x64 on windows-latest	10s
Python: 3.11-x86 on windows-latest	11s
Python: 3.11-x64 on macos-latest	17s
Python: 3.12-x64 on ubuntu-latest	23s
Python: 3.12-x64 on windows-latest	12s
Python: 3.12-x86 on windows-latest	11s
Python: 3.12-x64 on macos-latest	17s
Python: pypy-3.8-x64 on ubuntu-latest	1s
Python: pypy-3.8-x64 on windows-latest	1s
Python: pypy-3.8-x86 on windows-latest	1s
Python: pypy-3.8-x64 on macos-latest	1s
	5m 45s

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