Add power sweep functionality description in documentation #313

Job	Run time
Tox test (py38)	1m 45s
Tests on other platforms (windows-2019, 3.10)	2m 35s
Tests on paywalled platforms	0s
Tox test (py39)	1m 47s
Tests on other platforms (windows-2022, 3.11)	2m 22s
Tox test (py310)	1m 47s
Tests on other platforms (windows-2022, 3.12)	2m 25s
Tox test (py311)	1m 49s
Tests on other platforms (macos-12, 3.11)	1m 30s
Tox test (py312-cover)	2m 41s
Tests on other platforms (macos-13, 3.12)	1m 39s
Tox test (docs, graphviz)	2m 3s
Docker image	0s
PyPI packaging	0s
	22m 23s

Provide feedback