[3.9] bpo-41841: Prepare IDLE NEWS for 3.9.2 (#GH-4343)

Author: terryjreedy

Lib/idlelib/NEWS.txt

@@ -1,5 +1,5 @@
-What's New in IDLE 3.9.1
-Released on 2020-12-07?
+What's New in IDLE 3.9.2
+Released on 2021-02-15?
 ======================================
 
 
@@ -8,6 +8,11 @@ bpo-33065: Fix problem debugging user classes with __repr__ method.
 bpo-32631: Finish zzdummy example extension module: make menu entries
 work; add docstrings and tests with 100% coverage.
 
+
+What's New in IDLE 3.9.1
+Released on 2020-12-07
+======================================
+
 bpo-42508: Keep IDLE running on macOS.  Remove obsolete workaround
 that prevented running files with shortcuts when using new universal2
 installers built on macOS 11.