Vitaly review

docs/topics/tour/kotlin-tour-collections.md

@@ -250,7 +250,8 @@ To create a mutable map ([`MutableMap`](https://kotlinlang.org/api/latest/jvm/st
 use the [`mutableMapOf()`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/mutable-map-of.html) function.
 
 When creating maps, Kotlin can infer the type of items stored. To declare the type explicitly, add the types
-of the keys and values within angled brackets `<>` after the map declaration. For example: `MutableMap<Int, Int>`
+of the keys and values within angled brackets `<>` after the map declaration. For example: `MutableMap<String, Int>`.
+The keys have type `String` and the values have type `Int`.
 
 The easiest way to create maps is to use [`to`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/to.html) between each 
 key and its related value: