docs(examples): add kotlin string literals

Author: zoobestik

examples.md

@@ -43,7 +43,7 @@ Turns into:
 class Contact(val id: Int, var email: String) 
 
 fun main(args: Array<String>) {
-    val contact = Contact(1, "mary@gmail.com")
+    val contact = Contact(1, "mary@gmail.com $args, ${args.size}")
     println(contact.id)
 }
 ```
@@ -59,7 +59,7 @@ You can also change the playground theme or disable run button using `theme` and
 
 ```kotlin
 fun main(args: Array<String>) {
-    println("Hello World!")
+    println("Hello World! $args, ${args.size}")
 }
 ```
 
@@ -71,7 +71,7 @@ Or theme `darcula`
 
 ```kotlin
 fun main(args: Array<String>) {
-    println("Hello World!")
+    println("Hello World! $args, ${args.size}")
 }
 ```