Thanks for the bug report and patch, belopolsky!

The original patch no longer applies cleanly, so attached is a regenerated version.

* The new patch passes `make patchcheck`.
* The full test suite passes with this patch.
* I manually tested that before the patch, `./python.exe Lib/turtledemo/__main__.py` would start the demo window behind the Terminal on OSX, and after the patch it starts in front as desired.
* I manually checked the 3 help menu drop-down options in the demo, and they have the expected content.

There is a lot of out of date content in the turtle docs, and I think we should consider that work separate from this ticket and do a full audit of what needs updating in a new ticket.

=> commit review