docs: add section titles and descriptions

Author: kenjis

user_guide_src/source/outgoing/view_decorators.rst

@@ -2,20 +2,36 @@
 View Decorators
 ###############
 
+.. contents::
+    :local:
+    :depth: 2
+
+*************************
+What are View Decorators?
+*************************
+
 View Decorators allow your application to modify the HTML output during the rendering process. This happens just
 prior to being cached, and allows you to apply custom functionality to your views.
 
+You can use View Decorators with :doc:`view_renderer` or :doc:`view_parser`.
+
 *******************
 Creating Decorators
 *******************
 
+Creating Decorator Class
+========================
+
 Creating your own view decorators requires creating a new class that implements ``CodeIgniter\View\ViewDecoratorInterface``.
 This requires a single method that takes the generated HTML string, performs any modifications on it, and returns
 the resulting HTML.
 
 .. literalinclude:: view_decorators/001.php
 
-Once created, the class must be registered in ``app/Config/View.php``:
+Registering Decorator Class
+===========================
+
+Once created, the class must be registered in **app/Config/View.php**:
 
 .. literalinclude:: view_decorators/002.php
 

user_guide_src/source/outgoing/view_decorators/002.php

@@ -6,9 +6,9 @@
 
 class View extends BaseView
 {
+    // ...
+
     public array $decorators = [
         'App\Views\Decorators\MyDecorator',
     ];
-
-    // ...
 }