emberjs/website — pull request #1771 by jluckyiv (2014-10-31 12:00:06+00:00)
Title: Fix possessive errors and update for clarity

[its v. it's](http://grammar.about.com/od/words/a/itsgloss.htm), [that v. which](http://www.quickanddirtytips.com/education/grammar/which-versus-that-0).