docs: typo fix #494

Job	Run time
miri	10m 17s
minrust	4m 28s
cross (i686-unknown-linux-gnu)	1m 32s
loom	4m 38s
cross (armv7-unknown-linux-gnueabihf)	1m 33s
nightly	6m 51s
cross (powerpc-unknown-linux-gnu)	1m 43s
rustfmt	7s
cross (powerpc64-unknown-linux-gnu)	2m 3s
stable (ubuntu-latest)	2m 49s
cross (wasm32-unknown-unknown)	12s
tsan	4m 56s
stable (macos-latest)	2m 19s
stable (windows-latest)	4m 58s
Publish Documentation	4m 4s
	52m 30s

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