Clean up haddock hyperlinks of GHC API
This updates haddock comments only.
This MR focuses to update for hyperlinks in GHC API's haddock comments, because broken links especially discourage newcomers.
This MR includes following hierarchies:
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GHC top
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GHC.Driver.*
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GHC.Hs.*
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GHC.Core.*
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GHC.Stg.*
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GHC.Cmm.*
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GHC.Iface.*
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GHC.Llvm.*
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GHC.Parser.*
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GHC.Rename.*
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GHC.Tc.*
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GHC.HsToCore.*
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GHC.StgToCmm.*
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GHC.CmmToAsm.*
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GHC.Runtime.*
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GHC.Types.*
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GHC.Data.*
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GHC.Builtin.*
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GHC.Unit.*
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GHC.Utils.*
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GHC.SysTools.*