Add power sweep functionality description in documentation #206

Job	Run time
Tests on paywalled platforms (macos-13-xlarge, 3.12)	49s
Tox test (py38)	1m 52s
Tests on other platforms (windows-2019, 3.10)	3m 18s
Tox test (py39)	1m 53s
Tox test (py310)	1m 48s
Tests on other platforms (windows-2022, 3.11)	2m 46s
Tox test (py311)	1m 49s
Tests on other platforms (windows-2022, 3.12)	2m 23s
Tox test (py312-cover)	2m 47s
Tests on other platforms (macos-12, 3.11)	1m 31s
Tox test (docs, graphviz)	1m 51s
Tests on other platforms (macos-13, 3.12)	2m 13s
Docker image	59s
PyPI packaging	0s
	25m 59s

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