bpo-41841: Revise header (GH-24633)

terryjreedy · web-flow · commit b9fe16a02717 · 2021-02-23T21:24:33.000-05:00
diff --git a/Lib/idlelib/NEWS.txt b/Lib/idlelib/NEWS.txt
@@ -1,6 +1,7 @@
-What's New in IDLE 3.10.0 (since 3.9.0)
+What's New in IDLE 3.10.0
+(since 3.9.0)
 Released on 2021-10-04?
-======================================
+=========================
 
 
 bpo-43283: Document why printing to IDLE's Shell is often slower than
