To fixed https://github.com/PanJiaChen/vue-element-admin/issues/2586

Role Nmae => Role Name

- Icons view includes 2 small views: svg-icons and element-icons

This reverts commit 9ecec097.

style-guide: https://panjiachen.github.io/vue-element-admin-site/guide/advanced/style-guide.html#style-guide

其实这个属性还是看作者写菜单模糊搜索下拉框时候发现的，觉得体验非常棒。虽然文章模块这里只是一个示例，但是我觉得还是加上比较好。