fix tab in AnimationObjectGroup.html

docs/api/animation/AnimationObjectGroup.html

@@ -19,7 +19,7 @@
 		<h2>Usage:</h2>
 
 		<div class="desc">
-			Add objects you would otherwise pass as 'root' to the	constructor or the [page:AnimationMixer.clipAction clipAction]
+			Add objects you would otherwise pass as 'root' to the constructor or the [page:AnimationMixer.clipAction clipAction]
 			method of [page:AnimationMixer AnimationMixer] and instead pass this object as 'root'.<br /><br />
 
 			Note that objects of this class appear as one object to the mixer,