bpo-33821: Update IDLE section of What's New 3.7 (GH-15036)


* bpo-33821: Update IDLE section of What's New 3.7

* Fix roles.
(cherry picked from commit 5982b7201b84bfd24a1c2b2836401afee1cad8a7)

Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>
1 file changed