Docs: Fix typo in markup.

docs/api/en/animation/AnimationObjectGroup.html

@@ -40,7 +40,7 @@
 		<h3>[name]( [param:object obj1], [param:object obj2], [param:object obj3], ... )</h3>
 		<p>
 			[page:object obj] - an abitrary number of meshes that share the same animation state.
-		<p/>
+		</p>
 
 		<h2>Properties</h2>