haddock comments for GHC and GHCPackageConig

Distribution/Simple/GHC.hs

@@ -8,6 +8,9 @@
 -- Stability   :  alpha
 -- Portability :  portable
 --
+-- Build and Install implementations for GHC.  See
+-- 'Distribution.Simple.GHCPackageConfig.GHCPackageConfig' for
+-- registration-related stuff.
 
 {- Copyright (c) 2003-2005, Isaac Jones
 All rights reserved.

Distribution/Simple/GHCPackageConfig.hs

@@ -9,7 +9,8 @@
 -- Portability :  portable
 --
 -- Explanation: Performs registration for GHC.  Specific to
--- ghc-pkg. Creates a GHC package config file.
+-- ghc-pkg. Creates a GHC package config file.  See also
+-- 'Distribution.Simple.GHC.build', etc.
 
 module Distribution.Simple.GHCPackageConfig (
 	GHCPackageConfig(..),
@@ -37,7 +38,7 @@ import System.Directory (doesFileExist, getPermissions, Permissions (..))
 import Distribution.Compat.FilePath (joinFileName)
 import Distribution.Compat.Directory (getHomeDirectory)
 
--- |Where ghc keeps the --user files.
+-- |Where ghc versions < 6.3 keeps the --user files.
 -- |return the file, whether it exists, and whether it's readable
 
 localPackageConfig :: IO FilePath