docs: conform docstrings to PEP257 #49

Job	Run time
Build the documentation	36s
Lint the package	44s
Validate coverage	27s
Python: 3.7-x64 on ubuntu-latest	22s
Python: 3.7-x64 on windows-latest	1m 9s
Python: 3.7-x86 on windows-latest	1m 4s
Python: 3.7-x64 on macos-11	42s
Python: 3.8-x64 on ubuntu-latest	24s
Python: 3.8-x64 on windows-latest	1m 0s
Python: 3.8-x86 on windows-latest	1m 7s
Python: 3.8-x64 on macos-11	38s
Python: 3.9-x64 on ubuntu-latest	22s
Python: 3.9-x64 on windows-latest	1m 2s
Python: 3.9-x86 on windows-latest	55s
Python: 3.9-x64 on macos-11	38s
Python: 3.10-x64 on ubuntu-latest	21s
Python: 3.10-x64 on windows-latest	1m 5s
Python: 3.10-x86 on windows-latest	1m 7s
Python: 3.10-x64 on macos-11	38s
Python: 3.11-x64 on ubuntu-latest	26s
Python: 3.11-x64 on windows-latest	59s
Python: 3.11-x86 on windows-latest	1m 16s
Python: 3.11-x64 on macos-11	42s
Python: 3.12-x64 on ubuntu-latest	36s
Python: 3.12-x64 on windows-latest	57s
Python: 3.12-x86 on windows-latest	1m 15s
Python: 3.12-x64 on macos-11	48s
Python: pypy-3.8-x64 on ubuntu-latest	47s
Python: pypy-3.8-x64 on windows-latest	2m 14s
Python: pypy-3.8-x86 on windows-latest	1m 49s
Python: pypy-3.8-x64 on macos-11	1m 23s
	27m 33s

Provide feedback