Update 'Scene Actor Component model'

Scene-Actor-Component-model.md

@@ -8,10 +8,21 @@ In general, scenes (and the actors within them) *should not* reference other sce
 # Actors
 Actors represent the game entities within a scene. They have a transform (location, rotation, and scale), may be a child of another actor, and contain a set of components which define their behaviour. They also store a set of tags, which can be used to classify and filter for specific types of objects (e.g. terrain, enemies, players, UI).
 
+Newly created actors should be initialized using the `(initialize-actors-in)` function, like so:
+
+```common-lisp
+(initialize-actors-in my-scene
+    (new! actor :name "Example"
+        :component (new! sprite :texture my-texture)
+    (new! actor :name "Another example"
+        :location (vec2 4.20 -6.9)
+        :component (new! sprite :texture another-texture))
+```
+
 # Components
 Components define a group of behaviours and properties for the actor they're attached to. They can interact with other components and actors.
 
-If a component needs to automatically establish a reference to another component or actor, it should do this during late-stage initialization, eg. in `[component (activate)]`. Otherwise, the other object may not have been instantiated yet.
+If a component needs to automatically establish a reference to another component or actor, it should do this during late-stage initialization, eg. in `(activate)`. Otherwise, the other object may not have been instantiated yet.
 
 ## Lifecycle
 ![Component lifecycle diagram](https://bytes.keithhacks.cyou/keith/wh-engine/raw/branch/master/doc/component-lifecycle.svg)