Added haddock documentation

src/Semantic/FunctionChecker.hs

@@ -6,6 +6,7 @@ import Semantic.ExpressionChecker
 import Semantic.TypeChecker
 import Data.Either
 
+-- |Checks if all the inputs and the out of a function call have valid types, and then checks that the assign-output expression is valid
 checkFunction :: ([Type], [Symbol]) ->  Function -> Either [TypeCheckError] Function
 checkFunction (definedTypes, definedFunctions) (MakeFunction name desc inp out ex)
     | isRight checkedEx && isRight checkedOut && null (lefts checkedIn) = Right $ MakeFunction name desc (rights checkedIn) (fromRightUnsafe checkedOut) ex