Support haddock-library-1.11 in ghcide

[Bodigrim]

Currently it fails with

[24 of 73] Compiling Development.IDE.Spans.Common

src/Development/IDE/Spans/Common.hs:182:87: error:
    • Couldn't match type: (Int, H.DocH String String)
                     with: H.DocH String String
      Expected: [H.DocH String String]
        Actual: [(Int, H.DocH String String)]
    • In the second argument of ‘map’, namely ‘things’
      In the second argument of ‘($)’, namely
        ‘map
           (("1. " ++) . trimStart . splitForList . haddockToMarkdown) things’
      In the second argument of ‘(:)’, namely
        ‘(unlines
            $ map
                (("1. " ++) . trimStart . splitForList . haddockToMarkdown)
                things)’
    |
182 |   = '\n' : (unlines $ map (("1. " ++) . trimStart . splitForList . haddockToMarkdown) things)
    |                                                                                       ^^^^^^
Error: cabal: Failed to build ghcide-1.8.0.0 (which is required by
test:ghcide-tests from ghcide-1.8.0.0).

Cf. haskell/haddock#1523

[July541]

Resolved in #3303.