fix "Shutdown" -> "Shut down" (#1389) #2641

Job	Run time
Test Examples	59s
Test Docs	1m 7s
build (ubuntu-latest, 3.8)	5m 59s
build (ubuntu-latest, 3.11)	5m 44s
Check Links	5m 28s
Test Lint	58s
check_release	2m 27s
build (windows-latest, 3.8)	13m 48s
build (windows-latest, 3.11)	13m 37s
build (macos-latest, 3.8)	6m 4s
integration_check (ubuntu-latest, 3.8)	2m 22s
integration_check_pypy	2m 31s
build (macos-latest, 3.11)	9m 12s
integration_check (ubuntu-latest, 3.9)	2m 23s
Make SDist	31s
build (windows-latest, 3.9)	14m 51s
integration_check (ubuntu-latest, 3.10)	2m 28s
build (ubuntu-latest, pypy-3.8)	10m 0s
Test Minimum Versions	5m 22s
integration_check (ubuntu-latest, 3.11)	2m 32s
build (macos-latest, 3.10)	6m 13s
Test Prereleases	3m 54s
build (ubuntu-latest, 3.12)	6m 30s
Install from SDist and Test	4m 7s
coverage	17s
tests_check	1s
	2h 9m 25s

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