Updates swift_quiz.md Q7 (#90)

* Updates swift_quiz.md Q7

Code in Q7 or an answer was not correct, so here are possible options.

* Updates swift_quiz.md

Correcting Q11. I believe type of the function can be confirmed with assigning add() function to a constant and then check it's type with typeoff.

swift/swift_quiz.md

@@ -65,9 +65,9 @@ typealias Thing = [String, Any]
 var stuff: Thing
 print(type(of: stuff))
 ```
-- Dictionary<String, Any> <<<<---Correct
+- Dictionary<String, Any> (To print this than code in question has to be ```typealias Thing = [String: Any]```)
 - Dictionary
-- ERROR
+- ERROR <<<<---Correct (If code in question is really like that.)
 - Thing
 
 #### Q8. What is the value of y?
@@ -103,8 +103,8 @@ let y = x ?? 5
 ```swift
 func add(a: Int, b: Int) -> Int { return a+b }
 ```
-- Int <<<<---Correct
-- (Int, Int) -> Int
+- Int
+- (Int, Int) -> Int <<<<---Correct
 - Int<Optional>
 - Functions don't have types.