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Fix typo - 'on on' #1676

Job	Run time
docs	1m 1s
check	40s
py310 (ubuntu)	10m 33s
py39 (windows)	11m 34s
py38 (ubuntu)	9m 36s
py311 (ubuntu)	9m 47s
py311 (macos)	6m 39s
py311 (windows)	13m 37s
py39 (ubuntu)	9m 43s
py310 (windows)	12m 28s
Deploy docs to GitHub Pages	1m 16s
Upload coverage to Coveralls	9m 43s
	1h 36m 37s

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