docs: update "How to Enable Config Caching"

Author: kenjis

user_guide_src/source/concepts/factories.rst

@@ -316,27 +316,34 @@ Or simply delete the **writable/cache/FactoriesCache_config** file.
 How to Enable Config Caching
 ============================
 
-Uncomment the following code in **public/index.php**::
-
-    --- a/public/index.php
-    +++ b/public/index.php
-    @@ -49,8 +49,8 @@ if (! defined('ENVIRONMENT')) {
-     }
-
-     // Load Config Cache
-    -// $factoriesCache = new \CodeIgniter\Cache\FactoriesCache();
-    -// $factoriesCache->load('config');
-    +$factoriesCache = new \CodeIgniter\Cache\FactoriesCache();
-    +$factoriesCache->load('config');
-     // ^^^ Uncomment these lines if you want to use Config Caching.
-
-     /*
-    @@ -79,7 +79,7 @@ $app->setContext($context);
-     $app->run();
-
-     // Save Config Cache
-    -// $factoriesCache->save('config');
-    +$factoriesCache->save('config');
-     // ^^^ Uncomment this line if you want to use Config Caching.
-
-     // Exits the application, setting the exit code for CLI-based applications
+.. versionadded:: 4.5.0
+
+Set the following property to ``true`` in **app/Config/Cache.php**::
+
+    public bool $configCacheEnabled = true;
+
+.. note::
+    Prior to v4.5.0, uncomment the following code in **public/index.php**::
+
+        --- a/public/index.php
+        +++ b/public/index.php
+        @@ -49,8 +49,8 @@ if (! defined('ENVIRONMENT')) {
+         }
+
+         // Load Config Cache
+        -// $factoriesCache = new \CodeIgniter\Cache\FactoriesCache();
+        -// $factoriesCache->load('config');
+        +$factoriesCache = new \CodeIgniter\Cache\FactoriesCache();
+        +$factoriesCache->load('config');
+         // ^^^ Uncomment these lines if you want to use Config Caching.
+
+         /*
+        @@ -79,7 +79,7 @@ $app->setContext($context);
+         $app->run();
+
+         // Save Config Cache
+        -// $factoriesCache->save('config');
+        +$factoriesCache->save('config');
+         // ^^^ Uncomment this line if you want to use Config Caching.
+
+         // Exits the application, setting the exit code for CLI-based applications