rails/rails — pull request #11973 by prathamesh-sonpatki (2013-08-22 03:42:50+00:00)
Title: Add error message for including nokogiri in Gemfile for rake doc:guides

- When `rake doc:guides` is run from applications, it complains for
presence of redcarpet if it not present in Gemfile
- Similarly it should complain about nokogiri