Add sample for 'repeat' function

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

libraries/stdlib/src/kotlin/util/Standard.kt

@@ -128,6 +128,8 @@ public inline fun <T> T.takeUnless(predicate: (T) -> Boolean): T? {
  * Executes the given function [action] specified number of [times].
  *
  * A zero-based index of current iteration is passed as a parameter to [action].
+ *
+ * @sample samples.misc.ControlFlow.repeat
  */
 @kotlin.internal.InlineOnly
 public inline fun repeat(times: Int, action: (Int) -> Unit) {