Remove trailing >>> in enum docs

[E-Paine]

The enum docs has a trailing >>> which is not expected by sphinx and so is not coloured correctly (it is left black).

[ethanfurman]

@E-Paine: would you like your name in Misc/ACKS ? If so, please add yourself. I'll merge the changes when that's done or you let me know that you do not desire it.

Thank you for the fix!

[E-Paine]

@ethanfurman, thanks but isn't ACKS for non-trivial patches?

[ethanfurman]

From the header of that file:

Acknowledgements

This list is not complete and not in any useful order, but I would
like to thank everybody who contributed in any way, with code, hints,
bug reports, ideas, moral support, endorsement, or even complaints....
Without you, I would've stopped working on Python long ago!

--Guido

So I think adding yourself is appropriate. If adding yourself makes you want to fix more docs so you feel better about it, I'm okay with that! :-)

[E-Paine]

@ethanfurman thanks again. I hope to keep contributing for a while yet...