rails/rails — pull request #10597 by steveklabnik (2013-05-13 14:30:51+00:00)
Title: Adding notes on PATCH to the upgrade guide.

Discusses compatibility between PATCH and PUT, as well as how to add
support for JSON PATCH to your application.

Fixes #10439.

Submitting as a pull request for feedback.

/cc @fxn @jeremy