Add documentation for multiband #367

Job	Run time
Tests on paywalled platforms	0s
Tests on other platforms (windows-2019, 3.10)	4m 52s
Tox test (py38)	3m 25s
Tests on other platforms (windows-2022, 3.11)	3m 34s
Tox test (py39)	3m 14s
Tests on other platforms (windows-2022, 3.12)	4m 1s
Tox test (py310)	3m 18s
Tests on other platforms (macos-12, 3.11)	4m 15s
Tox test (py311)	3m 26s
Tests on other platforms (macos-13, 3.12)	4m 2s
Tox test (py312-cover)	6m 21s
Tox test (docs, graphviz)	1m 48s
Docker image	0s
PyPI packaging	0s
	42m 16s

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