rails/rails — pull request #15989 by nickpellant (2014-06-30 15:51:59+00:00)
Title: Fix 10.3 invite_email.body assert_match documentation example.

Currently there is no implicit conversion for `Mail::Body` to string
therefore `.to_s` must be applied. This is exampled in 10.2.2.

This pull request is to fix #15986 raised by @heidar.

Documentation change only.