fixes a typo in the FAQ
fixes a typo in the FAQ

maclover7/rails-contributors,amitsuroliya/rails-contributors,amitsuroliya/rails-contributors,maclover7/rails-contributors,maclover7/rails-contributors,fxn/rails-contributors,fxn/rails-contributors,amitsuroliya/rails-contributors,fxn/rails-contributors,amitsuroliya/rails-contributors,maclover7/rails-contributors,fxn/rails-contributors