Revert parts of cad58fb

Changelog links at the top of the components, and lowercased the 'c' in
notable changes. Personally, the styling isn't super important to me, but
it's what we always done in previous guides, so I figured it's better to
keep with what we've always done.

[ci skip]

guides/source/5_1_release_notes.md

@@ -228,60 +228,62 @@ can generate form tags based on URLs, scopes or models.
 Railties
 --------
 
+Please refer to the [Changelog][railties] for detailed changes.
+
 ### Removals
 
 ### Deprecations
 
-### Notable Changes
-
-Please refer to the [Changelog][railties] for detailed changes.
+### Notable changes
 
 Action Cable
 -----------
 
+Please refer to the [Changelog][action-cable] for detailed changes.
+
 ### Removals
 
 ### Deprecations
 
-### Notable Changes
+### Notable changes
 
 *   Added support for `channel_prefix` to Redis and evented Redis adapters
     in `cable.yml` to avoid name collisions when using the same Redis server
     with multiple applications.
     ([Pull Request](https://github.com/rails/rails/pull/27425))
 
-Please refer to the [Changelog][action-cable] for detailed changes.
-
 Action Pack
 -----------
 
+Please refer to the [Changelog][action-pack] for detailed changes.
+
 ### Removals
 
 ### Deprecations
 
-### Notable Changes
-
-Please refer to the [Changelog][action-pack] for detailed changes.
+### Notable changes
 
 Action View
 -------------
 
+Please refer to the [Changelog][action-view] for detailed changes.
+
 ### Removals
 
 ### Deprecations
 
-### Notable Changes
-
-Please refer to the [Changelog][action-view] for detailed changes.
+### Notable changes
 
 Action Mailer
 -------------
 
+Please refer to the [Changelog][action-mailer] for detailed changes.
+
 ### Removals
 
 ### Deprecations
 
-### Notable Changes
+### Notable changes
 
 *   Allowed setting custom content type when attachments are included
     and body is set inline.
@@ -298,16 +300,16 @@ Action Mailer
     an `args` key.
     ([Pull Request](https://github.com/rails/rails/pull/27900))
 
-Please refer to the [Changelog][action-mailer] for detailed changes.
-
 Active Record
 -------------
 
+Please refer to the [Changelog][active-record] for detailed changes.
+
 ### Removals
 
 ### Deprecations
 
-### Notable Changes
+### Notable changes
 
 *   Skipped comments in the output of `mysqldump` command by default.
     ([Pull Request](https://github.com/rails/rails/pull/23301))
@@ -320,38 +322,38 @@ Active Record
 *   Pass `"-v ON_ERROR_STOP=1"` flag with `psql` command to not suppress SQL errors.
     ([Pull Request](https://github.com/rails/rails/pull/24773))
 
-Please refer to the [Changelog][active-record] for detailed changes.
-
 Active Model
 ------------
 
+Please refer to the [Changelog][active-model] for detailed changes.
+
 ### Removals
 
 ### Deprecations
 
-### Notable Changes
-
-Please refer to the [Changelog][active-model] for detailed changes.
+### Notable changes
 
 Active Job
 -----------
 
+Please refer to the [Changelog][active-job] for detailed changes.
+
 ### Removals
 
 ### Deprecations
 
-### Notable Changes
-
-Please refer to the [Changelog][active-job] for detailed changes.
+### Notable changes
 
 Active Support
 --------------
 
+Please refer to the [Changelog][active-support] for detailed changes.
+
 ### Removals
 
 ### Deprecations
 
-### Notable Changes
+### Notable changes
 
 *   Added `Module#delegate_missing_to` to delegate method calls not
     defined for the current object to a proxy object.
@@ -361,8 +363,6 @@ Active Support
     of the current date & time.
     ([Pull Request](https://github.com/rails/rails/pull/24930))
 
-Please refer to the [Changelog][active-support] for detailed changes.
-
 Credits
 -------