Issue #5341: Fix a variety of spelling errors.
diff --git a/Lib/idlelib/NEWS.txt b/Lib/idlelib/NEWS.txt
index 27db970..965a8c1 100644
--- a/Lib/idlelib/NEWS.txt
+++ b/Lib/idlelib/NEWS.txt
@@ -300,7 +300,7 @@
   window raising, especially in the Windows menu and in the debugger.
   IDLEfork 763524.
 
-- If user passes a non-existant filename on the commandline, just
+- If user passes a non-existent filename on the commandline, just
   open a new file, don't raise a dialog.  IDLEfork 854928.