doc: fix typographical errors #2007

Job	Run time
build-for-x86-64-but-non-sse-target	38s
msrv	1m 42s
miri	32s
rebar	2m 37s
rustfmt	6s
wasm	1m 19s
test (stable, ubuntu-latest, stable)	1m 58s
wasm-no-simd128	52s
test (beta, ubuntu-latest, beta)	17s
test (nightly, ubuntu-latest, nightly)	15s
test (macos, macos-latest, stable)	1m 21s
test (win-msvc, windows-latest, stable)	5m 4s
test (win-gnu, windows-latest, stable-x86_64-gnu)	3m 23s
test (stable-x86, ubuntu-latest, stable, i686-unknown-linux-gnu)	1m 59s
test (stable-aarch64, ubuntu-latest, stable, aarch64-unknown-linux-gnu)	1m 58s
test (stable-powerpc64, ubuntu-latest, stable, powerpc64-unknown-linux-gnu)	2m 3s
test (stable-s390x, ubuntu-latest, stable, s390x-unknown-linux-gnu)	2m 14s
	28m 18s

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