bpo-33820: Fix IDLE What's New typo (#7594)

Author: terryjreedy

Doc/whatsnew/3.6.rst

@@ -1177,7 +1177,7 @@ Editor code context option revised.  Box displays all context lines up to
 maxlines.  Clicking on a context line jumps the editor to that line.  Context
 colors for custom themes is added to Highlights tab of Settings dialog.
 (Contributed by Cheryl Sabella and Terry Jan Reedy in :issue:`33642`,
-:issue:`33768`, and :issue:`33679`,
+:issue:`33768`, and :issue:`33679`)
 
 
 importlib