emberjs/website — pull request #1685 by netaisllc (2014-08-29 04:27:27+00:00)
Title: Correct an improper use of apostrophe.

Remove apostrophe; there is nothing that an RVSP promise possesses in this context.
The apostrophe would be correct if we were discussing an RSVP promise's life-cycle, it's ID property, or it's horoscope.