Doc: Update RectAreaLight.html (#23469)

* Update RectAreaLight.html

* Update RectAreaLight.html

docs/api/en/lights/RectAreaLight.html

@@ -34,7 +34,7 @@ rectLight.position.set( 5, 5, 0 );
 rectLight.lookAt( 0, 0, 0 );
 scene.add( rectLight )
 
-const rectLightHelper = new THREE.RectAreaLightHelper( rectLight );
+const rectLightHelper = new RectAreaLightHelper( rectLight );
 rectLight.add( rectLightHelper );
 		</code>
 

docs/api/zh/lights/RectAreaLight.html

@@ -33,7 +33,7 @@
 		rectLight.lookAt( 0, 0, 0 );
 		scene.add( rectLight )
 
-		rectLightHelper = new THREE.RectAreaLightHelper( rectLight );
+		rectLightHelper = new RectAreaLightHelper( rectLight );
 		scene.add( rectLightHelper );
 		</code>