fix some typos #21

Job	Run time
ci (tpb, ubuntu-22.04, --pb --threads --enable-libffi, test-some-fast)	38m 8s
ci (a6osx, macos-12)	16m 47s
ci (ta6osx, macos-12)	26m 46s
ci (i3le, ubuntu-22.04)	15m 40s
ci (ti3le, ubuntu-22.04)	24m 41s
ci (a6le, ubuntu-22.04)	13m 52s
ci (ta6le, ubuntu-22.04)	18m 14s
ci (ta6le, ubuntu-22.04, reboot, -m=ta6le --force, re.boot SCHEME="chezscheme", test-some-fast)	18m 47s
ci (i3nt, windows-2022, vs)	33m 39s
ci (ti3nt, windows-2022, vs)	36m 12s
ci (a6nt, windows-2022, vs)	33m 37s
ci (ta6nt, windows-2022, vs)	34m 15s
ci (ta6nt, windows-2022, gcc)	20m 7s
	5h 30m 45s

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