Fix link to soundfile docs #1320

Job	Run time
mypy	23s
ruff	6s
sdist	59s
parse_sdl (windows-latest, 3.2.16)	53s
parse_sdl (macos-latest, 3.2.16)	29s
test-docs	1m 58s
tox (ubuntu-latest)	2m 30s
linux-wheels (x86_64, pp310-manylinux*)	3m 33s
linux-wheels (x86_64, cp310-manylinux*)	4m 24s
build (ubuntu-latest, 3.10, x64)	3m 37s
linux-wheels (aarch64, cp310-manylinux*)	4m 21s
linux-wheels (aarch64, pp310-manylinux*)	3m 26s
build (windows-latest, 3.10, x64)	2m 47s
build (windows-latest, pypy-3.10, x64)	3m 30s
build-macos (cp310-*_universal2)	2m 35s
build-macos (pp310-*)	4m 25s
build (windows-latest, 3.10, x86)	3m 36s
build (ubuntu-latest, pypy-3.10, x64)	2m 57s
pyodide	2m 39s
publish	0s
	49m 8s

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