Apply Ryan's documentation fixes

Co-authored-by: Ryan Scott <[email protected]>

src/Text/LLVM/AST.hs

@@ -1,7 +1,7 @@
 {- |
 Because this library supports many LLVM versions, it is possible to construct
 an AST with the types in this module that only some LLVM versions will accept.
-These cases are usually documented in the haddocks for the relevant data types.
+These cases are usually documented in the Haddocks for the relevant data types.
 When trying to pretty-print constructions that are unsupported by the current
 LLVM version, pretty-printing may 'error'.
 

src/Text/LLVM/PP.hs

@@ -1369,8 +1369,8 @@ structBraces body = char '{' <+> body <+> char '}'
 ppMaybe :: Fmt a -> Fmt (Maybe a)
 ppMaybe  = maybe empty
 
--- | Throw an error if the ?config version is older than the given version. The
--- String indicates the constructor that is unavailable.
+-- | Throw an error if the @?config@ version is older than the given version. The
+-- String indicates which constructor is unavailable in the error message.
 onlyOnLLVM :: (?config :: Config) => LLVMVer -> String -> a -> a
 onlyOnLLVM fromVer name
   | llvmVer >= fromVer = id