remove variants paragraph indent in release notes. [ci skip]

guides/source/4_1_release_notes.md

@@ -31,36 +31,36 @@ Major Features
 
 ### Variants
 
-  We often want to render different html/json/xml templates for phones,
-  tablets, and desktop browsers. Variants makes it easy.
+We often want to render different html/json/xml templates for phones,
+tablets, and desktop browsers. Variants makes it easy.
 
-  The request variant is a specialization of the request format, like `:tablet`,
-  `:phone`, or `:desktop`.
+The request variant is a specialization of the request format, like `:tablet`,
+`:phone`, or `:desktop`.
 
-  You can set the variant in a before_action:
+You can set the variant in a before_action:
 
-  ```ruby
-    request.variant = :tablet if request.user_agent =~ /iPad/
-  ```
+```ruby
+request.variant = :tablet if request.user_agent =~ /iPad/
+```
 
-  Respond to variants in the action just like you respond to formats:
+Respond to variants in the action just like you respond to formats:
 
-  ```ruby
-    respond_to do |format|
-      format.html do |html|
-        html.tablet # renders app/views/projects/show.html+tablet.erb
-        html.phone { extra_setup; render ... }
-      end
-    end
-  ```
+```ruby
+respond_to do |format|
+  format.html do |html|
+    html.tablet # renders app/views/projects/show.html+tablet.erb
+    html.phone { extra_setup; render ... }
+  end
+end
+```
 
-  Provide separate templates for each format and variant:
+Provide separate templates for each format and variant:
 
-  ```
-    app/views/projects/show.html.erb
-    app/views/projects/show.html+tablet.erb
-    app/views/projects/show.html+phone.erb
-  ```
+```
+app/views/projects/show.html.erb
+app/views/projects/show.html+tablet.erb
+app/views/projects/show.html+phone.erb
+```
 
 ### Spring
 
@@ -86,6 +86,7 @@ bin/rails console
 ```
 
 **spring introspection:**
+
 ```
 $ bundle exec spring status
 Spring is running: