minor doc reword. Upgrade Rails itself not to Rails. [ci skip]

/cc @chancancode

1 files changed, 3 insertions, 3 deletions

diff --git a/guides/source/4_0_release_notes.md b/guides/source/4_0_release_notes.md
index c0eb77c1e7..19c690233c 100644
--- a/guides/source/4_0_release_notes.md
+++ b/guides/source/4_0_release_notes.md
@@ -15,7 +15,7 @@ These release notes cover only the major changes. To know about various bug fixe
 Upgrading to Rails 4.0
 ----------------------
 
-If you're upgrading an existing application, it's a great idea to have good test coverage before going in. You should also first upgrade to Rails 3.2 in case you haven't and make sure your application still runs as expected before attempting an update to Rails 4.0. A list of things to watch out for when upgrading is available in the [Upgrading to Rails](upgrading_ruby_on_rails.html#upgrading-from-rails-3-2-to-rails-4-0) guide.
+If you're upgrading an existing application, it's a great idea to have good test coverage before going in. You should also first upgrade to Rails 3.2 in case you haven't and make sure your application still runs as expected before attempting an update to Rails 4.0. A list of things to watch out for when upgrading is available in the [Upgrading Ruby on Rails](upgrading_ruby_on_rails.html#upgrading-from-rails-3-2-to-rails-4-0) guide.
 
 
 Creating a Rails 4.0 application
@@ -90,7 +90,7 @@ Major Features
  * **match do not catch all** ([commit](https://github.com/rails/rails/commit/90d2802b71a6e89aedfe40564a37bd35f777e541)) - In the routing DSL, match requires the HTTP verb or verbs to be specified.
  * **html entities escaped by default** ([commit](https://github.com/rails/rails/commit/5f189f41258b83d49012ec5a0678d827327e7543)) - Strings rendered in erb are escaped unless wrapped with `raw` or `html_safe` is called.
  * **New security headers** ([commit](https://github.com/rails/rails/commit/6794e92b204572d75a07bd6413bdae6ae22d5a82)) - Rails sends the following headers with every HTTP request: `X-Frame-Options` (prevents clickjacking by forbidding the browser from embedding the page in a frame), `X-XSS-Protection` (asks the browser to halt script injection) and `X-Content-Type-Options` (prevents the browser from opening a jpeg as an exe).
- 
+
 Extraction of features to gems
 ---------------------------
 
@@ -268,7 +268,7 @@ Please refer to the [Changelog](https://github.com/rails/rails/blob/4-0-stable/a
       * `scoped_by_...` can be rewritten using `where(...)`.
       * `find_or_initialize_by_...` can be rewritten using `find_or_initialize_by(...)`.
       * `find_or_create_by_...` can be rewritten using `find_or_create_by(...)`.
-      * `find_or_create_by_...!` can be rewritten using `find_or_create_by!(...)`. 
+      * `find_or_create_by_...!` can be rewritten using `find_or_create_by!(...)`.
 
 Credits
 -------