Docs: Removed distance from DirectionalLight.

docs/api/lights/DirectionalLight.html

@@ -50,12 +50,6 @@ scene.add( directionalLight );</code>
 			Default — *1.0*.
 		</div>
 
-		<h3>.[page:Float distance]</h3>
-		<div>
-			If non-zero, light will attenuate linearly from maximum intensity at light *position* down to zero at *distance*.<br />
-			Default — *0.0*.
-		</div>
-
 		<h3>.[page:Boolean onlyShadow]</h3>
 		<div>
 			If set to *true* light will only cast shadow but not contribute any lighting (as if *intensity* was 0 but cheaper to compute).<br />