Minor Haddock-related fixes

Fixes a few minor things in the code that were confusing the Haddock parser during "make haddock"

GenerateC.hs

@@ -862,7 +862,7 @@ abbrevVariable am (A.Record _) v
 abbrevVariable am t v
     = (genVariableAM v am, noSize)
 
--- | Generate the size part of a RETYPES/RESHAPES abbrevation of a variable.
+-- | Generate the size part of a RETYPES\/RESHAPES abbrevation of a variable.
 genRetypeSizes :: Meta -> A.AbbrevMode -> A.Type -> A.Name -> A.Type -> A.Variable -> CGen ()
 genRetypeSizes m am destT destN srcT srcV
     =  do size <- makeNonce "retype_size"

Parse.hs

@@ -1440,7 +1440,7 @@ retypesAbbrev
            return $ A.Specification m n $ A.RetypesExpr m A.ValAbbrev s e
     <?> "RETYPES/RESHAPES abbreviation"
 
--- | Check that a RETYPES/RESHAPES is safe.
+-- | Check that a RETYPES\/RESHAPES is safe.
 checkRetypes :: A.Type -> A.Type -> OccParser ()
 -- Retyping channels is always "safe".
 checkRetypes (A.Chan _) (A.Chan _) = return ()
@@ -2051,6 +2051,7 @@ includeFile file
                  return $ f p
 
 unknownPP :: OccParser A.Process
+unknownPP
     =  do m <- md
           char '#'
           rest <- manyTill anyChar (try eol)