Update load-on-demand.md

Author: luyu1314

docs/load-on-demand.md

@@ -72,7 +72,7 @@
    import App from './App'
 
    // 引入 按需组件的统一引入文件
-   import './core/use'
+   import './core/lazy_use'
 
    import './style/index.less'
 
@@ -92,4 +92,4 @@
 
 
 1.   Ant Design Vue 1.2.x 版本起，采用的 ant-design 官方方案 svg Icon 组件，整个项目打包会变大很多，图标进行按需加载可参考 https://github.com/HeskeyBaozi/reduce-antd-icons-bundle-demo
-2. moment 按需加载 可参考 https://github.com/jmblog/how-to-optimize-momentjs-with-webpack
+2. moment 按需加载 可参考 https://github.com/jmblog/how-to-optimize-momentjs-with-webpack