tweak haddock, remove CPP (only causes a warning with ghc 8.2.1), other small tweaks

Language/SQL/SimpleSQL/Dialect.lhs

@@ -21,29 +21,29 @@ Data types to represent different dialect options
 >     { -- | the list of reserved keywords
 >      diKeywords :: [String]
 >       -- | the list of reserved keywords, which can also be used as
->       -- | an identifier
+>       -- an identifier
 >     ,diIdentifierKeywords :: [String]
 >       -- | the list of reserved keywords, which can also be used as
->       -- | a function name (including aggregates and window
->       -- | functions)
+>       -- a function name (including aggregates and window
+>       -- functions)
 >     ,diAppKeywords :: [String]
 >      -- | all the type names which are also reserved keywords, and
->      -- | all the type names which are multiple words
+>      -- all the type names which are multiple words
 >     ,diSpecialTypeNames :: [String]
->      -- | does the dialect support ansi fetch first syntax
+>      -- | allow ansi fetch first syntax
 >     ,diFetchFirst :: Bool
->      -- | does the dialect support limit keyword (mysql, postgres,
->      -- |  ...)
+>      -- | allow limit keyword (mysql, postgres,
+>      -- ...)
 >     ,diLimit :: Bool
 >      -- | allow parsing ODBC syntax
 >     ,diOdbc :: Bool
->      -- | allow quoting identifiers with `backquotes`
+>      -- | allow quoting identifiers with \`backquotes\`
 >     ,diBackquotedIden :: Bool
 >      -- | allow quoting identifiers with [square brackets]
 >     ,diSquareBracketQuotedIden :: Bool
 >      -- | allow identifiers with a leading at @example
 >     ,diAtIdentifier :: Bool
->      -- | allow identifiers with a leading # #example
+>      -- | allow identifiers with a leading \# \#example
 >     ,diHashIdentifier :: Bool
 >      -- | allow positional identifiers like this: $1 
 >     ,diPositionalArg :: Bool

Language/SQL/SimpleSQL/Pretty.lhs

@@ -1,5 +1,4 @@
 
-> {-# LANGUAGE CPP #-}
 > -- | These is the pretty printing functions, which produce SQL
 > -- source from ASTs. The code attempts to format the output in a
 > -- readable way.
@@ -10,12 +9,8 @@
 >     ,prettyStatements
 >     ) where
 
-#if MIN_VERSION_base(4,11,0)
-
 > import Prelude hiding ((<>))
 
-#endif
-
 TODO: there should be more comments in this file, especially the bits
 which have been changed to try to improve the layout of the output.