improve docs

docs/config.md

@@ -164,7 +164,8 @@ $di->params[VendorClass::class] = [
 There might be other objects that you want to compile before serializing the container. A good example might be a 
 router. All routes might be compiled into a performant route dispatcher, if your routing package supports this.
 
-When creating a compiled instance you can pass config classes that implement the `ContainerCompileInterface`. This
+When creating a compiled instance you can pass config classes that implement the `ContainerCompileInterface` to the 
+`newCompiledInstance` and `configureCompiledInstance` methods of the _ContainerBuilder_. This
 interface is an extension of the `ContainerConfigInterface` and has a single method `compile(Container $di): void`. 
 That method is executed after the `define(Container $di): void` method from the `ContainerConfigInterface` and just 
 before the container is compiled.