bpo-33822: Update IDLE section of What's New 3.8 (GH-22383)

(cherry picked from commit 9c4eac7)

Co-authored-by: Terry Jan Reedy <[email protected]>

Author: miss-islington

Doc/whatsnew/3.8.rst

@@ -872,8 +872,18 @@ clipboard.  Converting strings from Tcl to Python and back now never fails.
 (Many people worked on this for eight years but the problem was finally
 solved by Serhiy Storchaka in :issue:`13153`.)
 
+New in 3.8.1:
+
+Add option to toggle cursor blink off.  (Contributed by Zackery Spytz
+in :issue:`4603`.)
+
+Escape key now closes IDLE completion windows.  (Contributed by Johnny
+Najera in :issue:`38944`.)
+
 The changes above have been backported to 3.7 maintenance releases.
 
+Add keywords to module name completion list.  (Contributed by Terry J.
+Reedy in :issue:`37765`.)
 
 inspect
 -------