Docs: Removed FaceNormalsHelper reference.

docs/examples/en/helpers/VertexNormalsHelper.html

@@ -15,8 +15,6 @@
 			Renders [page:ArrowHelper arrows] to visualize an object's vertex normal vectors.
 			Requires that normals have been specified in a [page:BufferAttribute custom attribute] or
 			have been calculated using [page:Geometry.computeVertexNormals computeVertexNormals].<br /><br />
-
-			Unlike [page:FaceNormalsHelper], this works with [page:BufferGeometry].
 		</p>
 
 		<h2>Code Example</h2>

docs/examples/zh/helpers/VertexNormalsHelper.html

@@ -15,8 +15,6 @@
 			渲染箭头辅助对象 [page:ArrowHelper arrows] 来模拟顶点的法线.
 			需要定义了法线缓存属性 [page:BufferAttribute custom attribute] 或
 			使用了 [page:Geometry.computeVertexNormals computeVertexNormals] 方法计算了顶点法线.<br /><br />
-
-			不像面法线辅助对象 [page:FaceNormalsHelper], 该辅助对象在 [page:BufferGeometry] 上也能正常运行.
 		</p>
 
 		<h2>代码示例</h2>