Update problem file

Author: AydinHassan

exercises/unite-the-types/problem/problem.md

@@ -6,31 +6,31 @@ In the process you should create a function named `adder` which accepts these nu
 
 The type of the parameter should be a union of all the types of numbers we might pass to your program.
 
-We will pass to your program any number of random numbers which could be integers, floats or strings. Your `adder` function
-should only accept these types.
+We will pass to your program any amount of random numbers which could be integers, floats or strings. Your `adder` function
+should only accept these types. Regardless of the type, every argument will be a number.
 
 You should output the sum of the numbers followed by a new line.
 
 How you print and add the numbers is up to you.
 
-### The advantages of match
+### The advantages of union types
 
-* Match uses strict equality, unlike switch which uses weak comparison and can lead to subtle bugs.
-* Each match arm does not fall through without a break statement, unlike switch.
-* Match expressions must be exhaustive, if there is no default arm specified, and no arm matches the given value, an `UnhandledMatchError` is thrown
-* Match is an expression and thus returns a value, reducing unnecessary variables and reducing the risk of accessing undefined variables.
+* Allows us to represent more complex types in a simpler manner, such as the pseudo `Number` type we are inventing here in this exercise.
+* The types are enforced by PHP so `TypeError`'s will be thrown when attempting to pass non-valid types.
+* Allows us to move information from phpdoc into function signatures.
+* It prevents incorrect function information. phpdocs can often go stale when they are not updated with the function itself.    
 
 
 ----------------------------------------------------------------------
 ## HINTS
 
 Remember the first argument will be the programs file path and not an argument passed to the program.
 
-The function must be called `adder`.
+The function you implement must be called `adder`.
 
 It is up to you to pass the numbers to your function.
 
-Documentation on the union types can be found by pointing your browser here:
+Documentation on union types can be found by pointing your browser here:
 [https://www.php.net/manual/en/language.types.declarations.php#language.types.declarations.union]()
 
 ----------------------------------------------------------------------