docs: included initialize example

lib/game/components/anchor.dart

@@ -2,6 +2,17 @@ import 'package:flame_forge2d/flame_forge2d.dart';
 
 /// {@template anchor}
 /// Non visual [BodyComponent] used to hold a [BodyType.dynamic] in [Joint]s.
+///
+/// It is recommended to [_position] the anchor first and then use the body
+/// position as the anchor point when initializing a [JointDef].
+///
+/// ```dart
+/// initialize(
+///   dynamicBody.body,
+///   anchor.body,
+///   anchor.body.position,
+/// );
+/// ```
 /// {@endtemplate}
 class Anchor extends BodyComponent {
   /// {@macro anchor}
@@ -14,6 +25,7 @@ class Anchor extends BodyComponent {
   @override
   Body createBody() {
     final bodyDef = BodyDef()..position = _position;
+
     return world.createBody(bodyDef);
   }
 }