Docs: Clean up. (#27135)

docs/api/ar/helpers/DirectionalLightHelper.html

@@ -20,6 +20,8 @@
 
 		<code>
 		const light = new THREE.DirectionalLight( 0xFFFFFF );
+		scene.add( light );
+
 		const helper = new THREE.DirectionalLightHelper( light, 5 );
 		scene.add( helper );
 		</code>

docs/api/en/helpers/DirectionalLightHelper.html

@@ -21,8 +21,9 @@
 
 		<code>
 		const light = new THREE.DirectionalLight( 0xFFFFFF );
-		const helper = new THREE.DirectionalLightHelper( light, 5 );
 		scene.add( light );
+
+		const helper = new THREE.DirectionalLightHelper( light, 5 );
 		scene.add( helper );
 		</code>
 

docs/api/it/helpers/DirectionalLightHelper.html

@@ -20,6 +20,8 @@
 
 		<code>
 		const light = new THREE.DirectionalLight( 0xFFFFFF );
+		scene.add( light );
+
 		const helper = new THREE.DirectionalLightHelper( light, 5 );
 		scene.add( helper );
 		</code>

docs/api/zh/helpers/DirectionalLightHelper.html

@@ -21,6 +21,8 @@
 
 		<code>
 		const light = new THREE.DirectionalLight( 0xFFFFFF );
+		scene.add( light );
+
 		const helper = new THREE.DirectionalLightHelper( light, 5 );
 		scene.add( helper );
 		</code>