Docs: Simplify "Creating-a-scene" guide.

docs/manual/en/introduction/Creating-a-scene.html

@@ -72,7 +72,7 @@
 		<p><em>"That's all good, but where's that cube you promised?"</em> Let's add it now.</p>
 
 		<code>
-		var geometry = new THREE.BoxGeometry( 1, 1, 1 );
+		var geometry = new THREE.BoxGeometry();
 		var material = new THREE.MeshBasicMaterial( { color: 0x00ff00 } );
 		var cube = new THREE.Mesh( geometry, material );
 		scene.add( cube );
@@ -139,7 +139,7 @@
 					renderer.setSize( window.innerWidth, window.innerHeight );
 					document.body.appendChild( renderer.domElement );
 
-					var geometry = new THREE.BoxGeometry( 1, 1, 1 );
+					var geometry = new THREE.BoxGeometry();
 					var material = new THREE.MeshBasicMaterial( { color: 0x00ff00 } );
 					var cube = new THREE.Mesh( geometry, material );
 					scene.add( cube );

docs/manual/zh/introduction/Creating-a-scene.html

@@ -72,7 +72,7 @@
 		<p><em>“嗯，看起来很不错，那你说的那个立方体在哪儿？”</em>接下来，我们就来添加立方体。</p>
 
 		<code>
-		var geometry = new THREE.BoxGeometry( 1, 1, 1 );
+		var geometry = new THREE.BoxGeometry();
 		var material = new THREE.MeshBasicMaterial( { color: 0x00ff00 } );
 		var cube = new THREE.Mesh( geometry, material );
 		scene.add( cube );
@@ -140,7 +140,7 @@
 					renderer.setSize( window.innerWidth, window.innerHeight );
 					document.body.appendChild( renderer.domElement );
 
-					var geometry = new THREE.BoxGeometry( 1, 1, 1 );
+					var geometry = new THREE.BoxGeometry();
 					var material = new THREE.MeshBasicMaterial( { color: 0x00ff00 } );
 					var cube = new THREE.Mesh( geometry, material );
 					scene.add( cube );