fix: improve core.networks module docstrings #302

Job	Run time
Tests on paywalled platforms (macos-13-xlarge, 3.12)	1m 47s
Tox test (py38)	3m 32s
Tests on other platforms (windows-2019, 3.10)	4m 38s
Tox test (py39)	3m 39s
Tests on other platforms (windows-2022, 3.11)	4m 14s
Tox test (py310)	3m 31s
Tests on other platforms (windows-2022, 3.12)	4m 40s
Tox test (py311)	3m 30s
Tests on other platforms (macos-13, 3.12)	4m 51s
Tox test (py312-cover)	6m 36s
Tests on other platforms (macos-14, 3.12)	2m 31s
Tox test (docs, graphviz)	1m 54s
Docker image	0s
PyPI packaging	0s
	45m 23s

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