Get rid of platform differences in Regex.find doc

libraries/stdlib/common/src/kotlin/TextH.kt

@@ -25,6 +25,7 @@ expect class Regex {
      *
      * @param startIndex An index to start search with, by default 0. Must be not less than zero and not greater than `input.length()`
      * @return An instance of [MatchResult] if match was found or `null` otherwise.
+     * @throws IndexOutOfBoundsException if [startIndex] is less than zero or greater than the length of the [input] char sequence.
      * @sample samples.text.Regexps.find
      */
     fun find(input: CharSequence, startIndex: Int = 0): MatchResult?