[zenstruck/foundry] add some comments to zenstruck_foundry.yaml

Author: ttskch

zenstruck/foundry/2.7/config/packages/zenstruck_foundry.yaml

@@ -5,4 +5,12 @@ when@dev: &dev
             # Flush only once per call of `PersistentObjectFactory::create()`
             flush_once: true
 
+    #　If you use the `make:factory --test` command, you may need to uncomment the following.
+    # See https://symfony.com/bundles/ZenstruckFoundryBundle/current/index.html#generate
+    #services:
+    #    App\Tests\Factory\:
+    #        resource: '../../tests/Factory/'
+    #        autowire: true
+    #        autoconfigure: true
+
 when@test: *dev