docs: fix broken links (#639) #497

Job	Run time
loom	3m 59s
minrust	4m 23s
miri	8m 37s
cross (i686-unknown-linux-gnu)	1m 0s
cross (armv7-unknown-linux-gnueabihf)	1m 11s
cross (powerpc-unknown-linux-gnu)	1m 9s
nightly	4m 56s
cross (powerpc64-unknown-linux-gnu)	1m 5s
rustfmt	6s
stable (ubuntu-latest)	1m 20s
cross (wasm32-unknown-unknown)	7s
stable (macos-latest)	3m 41s
tsan	4m 20s
stable (windows-latest)	2m 56s
Publish Documentation	3m 42s
	42m 32s

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