[docs] [issue8913] Document that datetime.__format__ is datetime.strftime

Eric Smith <eric@trueblade.com> added the comment: I'm okay with that. Grepping Lib shows that date/datetime/time and Decimal are the only types that implement __format__. Decimal largely implements the same language as float. ---------- _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue8913> _______________________________________