bpo-38636: Fix IDLE tab toggle and file indent width (GH-17008)

These Format menu functions (default shortcuts Alt-T and Alt-U)
were mistakenly disabled in 3.7.5 and 3.8.0.
diff --git a/Lib/idlelib/NEWS.txt b/Lib/idlelib/NEWS.txt
index b02a988..c6aa00d 100644
--- a/Lib/idlelib/NEWS.txt
+++ b/Lib/idlelib/NEWS.txt
@@ -3,6 +3,10 @@
 ======================================
 
 
+bpo-38636: Fix IDLE Format menu tab toggle and file indent width. These
+functions (default shortcuts Alt-T and Alt-U) were mistakenly disabled
+in 3.7.5 and 3.8.0.
+
 bpo-4360: Add an option to toggle IDLE's cursor blink for shell,
 editor, and output windows.  See Settings, General, Window Preferences,
 Cursor Blink.  Patch by Zachary Spytz.