Fix minor typo in deprecation string #983

Job	Run time
mypy	24s
ruff	6s
sdist	39s
tox (ubuntu-latest)	2m 52s
tox (windows-latest)	2m 11s
parse_sdl (windows-latest, 2.30.0)	37s
parse_sdl (windows-latest, 2.0.14)	32s
parse_sdl (macos-latest, 2.0.16)	20s
build (windows-latest, pypy-3.8, x64)	4m 38s
parse_sdl (macos-latest, 2.30.0)	19s
build (ubuntu-latest, pypy-3.8, x64)	2m 47s
build (windows-latest, pypy-3.8, x86)	4m 23s
build (ubuntu-latest, 3.8, x64)	3m 13s
build (windows-latest, 3.8, x64)	3m 24s
linux-wheels (x86_64, cp38-manylinux*)	1m 59s
linux-wheels (x86_64, pp38-manylinux*)	1m 53s
linux-wheels (aarch64, pp38-manylinux*)	11m 22s
build (windows-latest, 3.8, x86)	3m 54s
linux-wheels (aarch64, cp38-manylinux*)	12m 33s
parse_sdl (macos-latest, 2.0.14)	18s
test-docs	2m 26s
build-macos (pp38-*)	3m 49s
build-macos (cp38-*_universal2)	5m 42s
parse_sdl (windows-latest, 2.0.16)	43s
publish	0s
	1h 11m 4s

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