Disable ghc docs by default #2934

Job	Run time
cabal-doExactConfig	44s
cabal	11s
nix-build	5m 11s
runghc	1m 21s
tests-benchmarks	1m 6s
unit-tests	5s
build-extra-hackages	6s
maintainer-scripts	7s
multi-target	21s
plan-extra-hackages	8s
shellFor-multiple-package	36s
shellFor-not-depends	16s
shellFor-single-package	6h 0m 13s
shellFor-hoogle	6h 0m 10s
check-materialization-concurrency	20s
check-path-support	9s
closure-size	3s
docs	49s
haskell-nix-roots-do-not-require-IFDs	13s
hix	54s
hix-cabal	8s
hydra-ifdLevel-0-and-1	2m 11s
hydra-ifdLevel-2	2m 11s
hydra-ifdLevel-3	30m 14s
hydra-without-remote-builders-ghc9101	42s
nix-tools	11s
hydra-without-remote-builders-ghc966	37s
update-docs	4s
	12h 49m 21s

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