working on documentation

haskell/lib/Error.hs

@@ -1,13 +1,24 @@
-module Error where
+module Error
+  ( Error(..)
+  , IOEitherError
+  , assignError
+  ) where
 
 
+-- ^ Error type for the application
 data Error
-  = MkUnknownError String
-  | MkErrorSpawningProcess String
-  | MkSystemError Int String String
+  = MkUnknownError
+      String -- ^ error message
+  | MkErrorSpawningProcess
+      String -- ^ error message
+  | MkSystemError
+      Int -- ^ System error code
+      String -- ^ String1
+      String -- ^ String2
   deriving Show
 
-type IOEitherError a = IO (Either Error a)
+-- ^ Type synonym for an IO action with either returns an Error or a parsed value
+type IOEitherError a = IO ( Either Error a)
 
 assignError :: String -> Error
 assignError = MkUnknownError