docs: add notes for environment variables

Author: kenjis

user_guide_src/source/concepts/autoloader.rst

@@ -193,3 +193,7 @@ How to Enable FileLocator Caching
 Set the following property to ``true`` in **app/Config/Optimize.php**::
 
     public bool $locatorCacheEnabled = true;
+
+.. note::
+    This property cannot be overridden by
+    :ref:`environment variables <configuration-classes-and-environment-variables>`.

user_guide_src/source/concepts/factories.rst

@@ -322,6 +322,10 @@ Set the following property to ``true`` in **app/Config/Optimize.php**::
 
     public bool $configCacheEnabled = true;
 
+.. note::
+    This property cannot be overridden by
+    :ref:`environment variables <configuration-classes-and-environment-variables>`.
+
 .. note::
     Prior to v4.5.0, uncomment the following code in **public/index.php**::