doc: Fix a typo (#204) #786

Job	Run time
clippy	15s
fmt	3s
msrv (ubuntu-latest)	32s
cross (ubuntu-latest)	1m 23s
msrv (windows-latest)	1m 11s
security_audit	11s
cross (macos-latest)	1m 4s
test (ubuntu-latest, nightly)	39s
windows_gnu (nightly, x86_64-pc-windows-gnu)	1m 10s
test (ubuntu-latest, beta)	39s
test (ubuntu-latest, stable)	32s
test (windows-latest, nightly)	1m 15s
test (windows-latest, beta)	1m 15s
test (windows-latest, stable)	1m 14s
test (macos-latest, nightly)	43s
test (macos-latest, beta)	42s
test (macos-latest, stable)	48s
	13m 36s

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