Document exceptions that can be thrown from MatchGroupCollection.get(name)

libraries/stdlib/src/kotlin/text/regex/MatchResult.kt

@@ -35,6 +35,8 @@ public interface MatchNamedGroupCollection : MatchGroupCollection {
     /**
      * Returns a named group with the specified [name].
      * @return An instance of [MatchGroup] if the group with the specified [name] was matched or `null` otherwise.
+     * @throws IllegalArgumentException if there is no group with the specified [name] defined in the regex pattern.
+     * @throws UnsupportedOperationException if getting named groups isn't supported on the current platform.
      */
     public operator fun get(name: String): MatchGroup?
 }