Object3D: Document events. (#27755)

docs/api/en/core/Object3D.html

@@ -604,6 +604,28 @@
 			Converts the vector from world space to this object's local space.
 		</p>
 
+		<h2>Events</h2>
+
+		<h3>added</h3>
+		<p>
+			Fires when the object has been added to its parent object.
+		</p>
+
+		<h3>removed</h3>
+		<p>
+			Fires when the object has been removed from its parent object.
+		</p>
+
+		<h3>childadded</h3>
+		<p>
+			Fires when a new child object has been added.
+		</p>
+
+		<h3>childremoved</h3>
+		<p>
+			Fires when a new child object has been removed.
+		</p>
+
 		<h2>Source</h2>
 
 		<p>