Add inline documentation to remaining public methods

Sources/FTTestingKit/Int+Times.swift

@@ -1,11 +1,18 @@
-public extension Int {
-    func times(execute: () -> Void) {
+extension Int {
+    /// Executes supplied closure n-times.
+    /// Handy for time measurement tests.
+    /// - Parameter execute: Closure executed n-times.
+    public func times(execute: () -> Void) {
         for _ in 0..<self {
             execute()
         }
     }
 
-    func times<T>(execute: () -> T) -> [T] {
+    /// Creates array of items by executing supplied
+    /// closure n-times. Handy for generating
+    /// arrays of random values.
+    /// - Parameter execute: Closure returning some item n-times.
+    public func times<T>(execute: () -> T) -> [T] {
         return (0..<self).map { _ in execute() }
     }
 }

Sources/FTTestingKit/String+Mockup.swift

@@ -6,6 +6,9 @@ extension String: Mockup {
         return random(length: 15, characters: mockupCharacters)
     }
 
+    /// Generates random string of required length from supplied characters.
+    /// - Parameter length: Length of the generated string in characters.
+    /// - Parameter characters: Array of characters used to generate the random string.
     public static func random(
         length: Int,
         characters: [Character]