KT-20357 Add samples for Map.containsValue

Co-authored-by: Ilya Gorbunov <ilya.gorbunov@jetbrains.com>

libraries/stdlib/src/kotlin/collections/Maps.kt

@@ -211,6 +211,8 @@ public inline fun <@kotlin.internal.OnlyInputTypes K> Map<out K, *>.containsKey(
  * Returns `true` if the map maps one or more keys to the specified [value].
  *
  * Allows to overcome type-safety restriction of `containsValue` that requires to pass a value of type `V`.
+ *
+ * @sample samples.collections.Maps.Usage.containsValue
  */
 @Suppress("EXTENSION_SHADOWED_BY_MEMBER") // false warning, extension takes precedence in some cases
 @kotlin.internal.InlineOnly