Release Note: New `indexOf(String,int,int)` Variant Added to `String` to Support a Range of Indices

A new method `indexOf(String str, int beginIndex, int endIndex)` method is added to `java.lang.String` to support a forward search of `String` `str`, and limited to the specified range of indices.

Besides full control on the range, it is safer to use than `indexOf(String str, int fromIndex)` because it throws an exception on illegal search ranges.