Fix outdated docstring in `_msvccompiler` #1120

Job	Run time
ci_setuptools (3.10, ubuntu-latest)	4m 8s
collateral (diffcov)	56s
test_cygwin (39, windows-latest)	4m 45s
collateral (docs)	41s
test (3.8, ubuntu-latest)	50s
test (3.8, macos-latest)	1m 16s
test (3.8, windows-latest)	2m 22s
test_msvc_python_mingw	2m 3s
test_msys2_mingw (mingw64, x86_64, gcc, g++)	1m 37s
test (3.12, ubuntu-latest)	46s
test_msys2_mingw (mingw32, i686, gcc, g++)	2m 10s
test (3.12, macos-latest)	1m 1s
test_msys2_mingw (ucrt64, ucrt-x86_64, gcc, g++)	2m 6s
test (3.12, windows-latest)	2m 14s
test_msys2_mingw (clang64, clang-x86_64, clang, clang++)	1m 52s
test (3.9, ubuntu-latest)	58s
test (3.10, ubuntu-latest)	45s
test (3.11, ubuntu-latest)	47s
test (pypy3.10, ubuntu-latest)	1m 58s
check	4s
release	0s
	33m 19s

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