Add migration notes for Configure attribute

Author: othercorey

en/appendices/5-3-migration-guide.rst

@@ -74,6 +74,19 @@ Command
 - ``cake server`` now supports a ``--frankenphp`` option that will start the
   development server with `FrankenPHP <https://frankenphp.dev/>`__.
 
+Core
+----
+
+- Added ``Configure`` attribute to support injecting ``Configure`` values into
+  constructor arguments::
+
+    class InjectedService
+    {
+        public function __construct(
+            #[Configure('MyService.apiKey')] protected string $apiKey,
+        ) { }
+    }
+
 Cache
 -----
 

en/development/dependency-injection.rst

@@ -216,10 +216,23 @@ services like in a reporting system::
 Using Configuration Data
 ------------------------
 
-Often you'll need configuration data in your services. While you could add
-all the configuration keys your service needs into the container, that can be
-tedious. To make configuration easier to work with CakePHP includes an
-injectable configuration reader::
+Often you'll need configuration data in your services. If you need a specific value,
+you can inject it as a constructor argument using the ``Cake\Core\Attribute\Configure``
+attribute::
+
+    use Cake\Core\Attribute\Configure;
+
+    class InjectedService
+    {
+        public function __construct(
+            #[Configure('MyService.apiKey')] protected string $apiKey,
+        ) { }
+    }
+
+.. versionadded:: 5.3.0
+
+If you want to inject a copy of all configuration data, CakePHP includes
+an injectable configuration reader::
 
     use Cake\Core\ServiceConfig;