bpo-46496: news11-10 for bpo45296 (GH-30937)

diff --git a/Lib/idlelib/NEWS.txt b/Lib/idlelib/NEWS.txt
index a1c6412..ed2b05e 100644
--- a/Lib/idlelib/NEWS.txt
+++ b/Lib/idlelib/NEWS.txt
@@ -4,6 +4,12 @@
 =========================
 
 
+bpo-45296: Clarify close, quit, and exit in IDLE.  In the File menu,
+'Close' and 'Exit' are now 'Close Window' (the current one) and 'Exit'
+is now 'Exit IDLE' (by closing all windows).  In Shell, 'quit()' and
+'exit()' mean 'close Shell'.  If there are no other windows,
+this also exits IDLE.
+
 bpo-45495: Add context keywords 'case' and 'match' to completions list.
 
 bpo-45296: On Windows, change exit/quit message to suggest Ctrl-D, which