Fix typo in `_memory.pyx` docstring #5554

Job	Run time
build_linux (3.9)	36m 25s
build_linux (3.10)	37m 8s
build_windows (3.9)	1h 17m 13s
build_linux (3.11)	37m 54s
build_windows (3.10)	1h 4m 28s
build_linux (3.12)	36m 58s
build_windows (3.11)	59m 51s
build_windows (3.12)	1h 6m 42s
build_linux (3.13)	37m 1s
build_windows (3.13)	1h 7m 10s
test_linux (3.9, false, ubuntu-22.04)	11m 46s
array-api-conformity (3.10, false, ubuntu-22.04)	5m 7s
test_linux (3.10, false, ubuntu-22.04)	11m 23s
test_examples_linux (3.11, false, ubuntu-22.04)	8m 12s
test_linux (3.11, false, ubuntu-22.04)	11m 21s
test_linux (3.12, false, ubuntu-22.04)	11m 57s
test_linux (3.13, false, ubuntu-22.04)	11m 7s
upload_linux	0s
test_windows (3.9, false, windows-2019)	12m 19s
test_windows (3.10, false, windows-2019)	13m 37s
test_windows (3.11, false, windows-2019)	12m 41s
test_windows (3.12, false, windows-2019)	12m 48s
test_windows (3.13, false, windows-2019)	12m 41s
upload_windows	0s
Clean up anaconda packages	0s
	10h 55m 49s

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