[plt-scheme] paired braces in interaction mode?

On Sat, Mar 1, 2008 at 3:53 PM, Robby Findler <robby at cs.uchicago.edu> wrote:
>  I've brought that back highlighting of previous repl expressions to
>  DrScheme (in the new paren matcher). You can also hit return while the
>  cursor is at the end of an sexp to bring it down to the latest prompt
>  (if you select something and hit return, that brings down the
>  selection). This is now checked in to SVN.

I'm not totally clear how this works. Where will this feature appear
in the new documentation?