Prepare for RC: link to the 4-2-stable [ci skip]

guides/source/4_2_release_notes.md

@@ -10,13 +10,13 @@ Highlights in Rails 4.2:
 
 These release notes cover only the major changes. To learn about various bug
 fixes and changes, please refer to the change logs or check out the [list of
-commits](https://github.com/rails/rails/commits/master) in the main Rails
+commits](https://github.com/rails/rails/commits/4-2-stable) in the main Rails
 repository on GitHub.
 
 --------------------------------------------------------------------------------
 
 NOTE: This document is a work in progress, please help to improve this by sending
-a [pull request](https://github.com/rails/rails/edit/master/guides/source/4_2_release_notes.md).
+a [pull request](https://github.com/rails/rails/edit/4-2-stable/guides/source/4_2_release_notes.md).
 
 Upgrading to Rails 4.2
 ----------------------

guides/source/upgrading_ruby_on_rails.md

@@ -51,7 +51,7 @@ Upgrading from Rails 4.1 to Rails 4.2
 -------------------------------------
 
 NOTE: This section is a work in progress, please help to improve this by sending
-a [pull request](https://github.com/rails/rails/edit/master/guides/source/upgrading_ruby_on_rails.md).
+a [pull request](https://github.com/rails/rails/edit/4-2-stabble/guides/source/upgrading_ruby_on_rails.md).
 
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