Fix outdated docstring in `_msvccompiler` #1127

Job	Run time
test_msys2_mingw (mingw64, x86_64, gcc, g++)	1m 35s
test_msys2_mingw (mingw32, i686, gcc, g++)	2m 2s
collateral (diffcov)	50s
ci_setuptools (3.10, ubuntu-latest)	3m 34s
test_msys2_mingw (ucrt64, ucrt-x86_64, gcc, g++)	1m 36s
test (3.8, ubuntu-latest)	38s
collateral (docs)	27s
test_msys2_mingw (clang64, clang-x86_64, clang, clang++)	1m 48s
test (3.8, macos-latest)	1m 13s
test_cygwin (39, windows-latest)	4m 32s
test (3.8, windows-latest)	2m 23s
test_msvc_python_mingw	1m 58s
test (3.12, ubuntu-latest)	42s
test (3.12, macos-latest)	48s
test (3.12, windows-latest)	1m 44s
test (3.9, ubuntu-latest)	46s
test (3.10, ubuntu-latest)	40s
test (3.11, ubuntu-latest)	40s
test (pypy3.10, ubuntu-latest)	1m 52s
check	2s
release	0s
	29m 50s

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