update camera according to the @WestLangley's suggestion

docs/api/cameras/Camera.html

@@ -41,7 +41,7 @@
 		<div>
 		vector — point to look at<br />
 		<br />
-		This make the camera look at the vector position in local space.
+		This make the camera look at the vector position in the global space as long as the parent of this camera is the scene or at position (0,0,0).
 		</div>