Fix markdown on docs (#2418) #3293

Job	Run time
nix-build	2h 10m 57s
unit-tests	12s
runghc	11m 22s
shellFor-hoogle	2m 52s
shellFor-not-depends	1m 28s
cabal	1m 43s
maintainer-scripts	13s
multi-target	5m 46s
tests-benchmarks	41s
cabal-doExactConfig	11m 57s
shellFor-multiple-package	39s
shellFor-single-package	1m 19s
plan-extra-hackages	16s
hix	1m 41s
closure-size	10s
check-nix-tools	26s
hydra-ifdLevel-0-and-1	6m 29s
hydra-without-remote-builders-ghc967	5m 39s
update-docs	49s
hydra-without-remote-builders-ghc9102	4m 1s
build-extra-hackages	16s
hix-cabal	19s
check-materialization-concurrency	55s
check-path-support	2m 30s
docs	2m 49s
hydra-ifdLevel-2	9m 44s
hydra-ifdLevel-3	30m 18s
haskell-nix-roots-do-not-require-IFDs	8m 26s
	4h 3m 57s

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