Minor improvements and deprecation warning for SplineCurve3 doc v2

docs/api/extras/curves/SplineCurve3.html

@@ -45,7 +45,7 @@ var splineObject = new THREE.Line( geometry, material );
 
 
 		<h3>[name]( [page:Array points] )</h3>
-		<div>points – An array of [page:Vector3] points</div>
+		<div>points – An array of [page:Vector3] points that define the curve.</div>
 
 
 		<h2>Properties</h2>