Docs: Change description of Sprite.raycast().

docs/api/en/objects/Sprite.html

@@ -79,7 +79,7 @@ scene.add( sprite );
 		<h3>[method:null raycast]( [param:Raycaster raycaster], [param:Array intersects] )</h3>
 		<p>
 		Get intersections between a casted ray and this sprite. [page:Raycaster.intersectObject]() will call this method.
-		You have to setup your raycaster with [page:Raycaster.setFromCamera]() when raycasting against sprites.
+		The raycaster must be initialized by calling [page:Raycaster.setFromCamera]() before raycasting against sprites.
 		</p>