Issue #22384: An exception in Tkinter callback no longer crashes the program
when it is run with pythonw.exe.

Documented that Tk.report_callback_exception() is purposed to be overriden in
applications.
Issue #22384: An exception in Tkinter callback no longer crashes the program
when it is run with pythonw.exe.

Documented that Tk.report_callback_exception() is purposed to be overriden in
applications.