Add samples for reversed list views

#KT-20357

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

@@ -46,12 +46,14 @@ private fun List<*>.reversePositionIndex(index: Int) =
 /**
  * Returns a reversed read-only view of the original List.
  * All changes made in the original list will be reflected in the reversed one.
+ * @sample samples.collections.ReversedViews.asReversedList
  */
 public fun <T> List<T>.asReversed(): List<T> = ReversedListReadOnly(this)
 
 /**
  * Returns a reversed mutable view of the original mutable List.
  * All changes made in the original list will be reflected in the reversed one and vice versa.
+ * @sample samples.collections.ReversedViews.asReversedMutableList
  */
 @kotlin.jvm.JvmName("asReversedMutable")
 public fun <T> MutableList<T>.asReversed(): MutableList<T> = ReversedList(this)