Correct docstring of Container helper class #5025

Job	Run time
build_linux (3.9)	36m 13s
build_linux (3.10)	37m 12s
build_linux (3.11)	37m 33s
build_linux (3.12)	37m 23s
build_windows (3.9)	1h 10m 43s
build_windows (3.10)	1h 9m 4s
build_windows (3.11)	1h 6m 48s
build_windows (3.12)	1h 11m 41s
array-api-conformity (3.10, false, ubuntu-22.04)	7m 8s
test_linux (3.9, false, ubuntu-22.04)	12m 37s
test_linux (3.10, false, ubuntu-22.04)	10m 20s
test_examples_linux (3.11, false, ubuntu-22.04)	24m 20s
test_linux (3.11, false, ubuntu-22.04)	11m 39s
test_linux (3.12, false, ubuntu-22.04)	11m 35s
upload_linux	0s
test_windows (3.9, false, windows-2019)	15m 6s
test_windows (3.10, false, windows-2019)	15m 12s
test_windows (3.11, false, windows-2019)	14m 20s
test_windows (3.12, false, windows-2019)	14m 17s
upload_windows	0s
Clean up anaconda packages	0s
	9h 23m 11s

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