Add documentation for multiband #368

Job	Run time
Tests on paywalled platforms	0s
Tests on other platforms (windows-2019, 3.10)	4m 9s
Tox test (py38)	3m 14s
Tests on other platforms (windows-2022, 3.11)	4m 27s
Tox test (py39)	3m 15s
Tox test (py310)	3m 13s
Tests on other platforms (windows-2022, 3.12)	3m 23s
Tests on other platforms (macos-12, 3.11)	3m 15s
Tox test (py311)	3m 8s
Tests on other platforms (macos-13, 3.12)	4m 44s
Tox test (py312-cover)	6m 21s
Tox test (docs, graphviz)	1m 51s
PyPI packaging	0s
Docker image	0s
	41m 0s

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