Document Bytestring is UTF-8 encoded

Co-authored-by: Julian Ospald <hasufell@posteo.de>

Author: fendor

plugins/hls-cabal-plugin/src/Ide/Plugin/Cabal/Parse.hs

@@ -40,7 +40,7 @@ parseCabalFile =
         parseCabalFileContents bs
 
 parseCabalFileContents
-    :: BS.ByteString
+    :: BS.ByteString -- ^ UTF-8 encoded bytestring
     -> IO ([PWarning], Either (Maybe Version, NonEmpty PError) GenericPackageDescription)
 parseCabalFileContents bs =
     pure $ runParseResult (parseGenericPackageDescription bs)