doc: update umi config file of custom them

docs/react/customize-theme.en-US.md

@@ -69,7 +69,7 @@ Note that do not exclude antd package in node_modules when using less-loader.
 
 ### Customize in roadhog or Umi
 
-You can easily use `theme` field in `.webpackrc` file of your project root directory if you are using [roadhog](https://github.com/sorrycc/roadhog) or [Umi](http://umijs.org/)，which could be a object or a javascript file path.
+You can easily use `theme` field in [.webpackrc](https://github.com/ant-design/ant-design-pro/blob/b7e7983661eb5e53dc807452e9653e93e74276d4/.webpackrc.js#L18) (roadhog) or [config/config.js](https://github.com/ant-design/ant-design-pro/blob/56e648ec14bdb9f6724169fd64830447e224ccb1/config/config.js#L45) (Umi) file of your project root directory if you are using [roadhog](https://github.com/sorrycc/roadhog) or [Umi](http://umijs.org/)，which could be a object or a javascript file path.
 
 ```js
 "theme": {
@@ -77,7 +77,7 @@ You can easily use `theme` field in `.webpackrc` file of your project root direc
 },
 ```
 
-Or just [a javascript file path](https://github.com/ant-design/ant-design-pro/blob/3c2a056ef0dac06ce3b4389192691bb1f5c448e2/.webpackrc.js#L19):
+Or just [a javascript file path](https://github.com/ant-design/ant-design-pro/blob/b7e7983661eb5e53dc807452e9653e93e74276d4/.webpackrc.js#L18):
 
 ```js
 "theme": "./theme.js",

docs/react/customize-theme.zh-CN.md

@@ -69,7 +69,7 @@ module.exports = {
 
 ### 在 roadhog 或 Umi 里配置主题
 
-如果你在使用 [roadhog](https://github.com/sorrycc/roadhog) 或者 [Umi](http://umijs.org/)，那么可以很方便地在项目根目录的 `.webpackrc` 文件中 `theme` 字段进行主题配置。`theme` 可以配置为一个对象或文件路径。
+如果你在使用 [roadhog](https://github.com/sorrycc/roadhog) 或者 [Umi](http://umijs.org/)，那么可以很方便地在项目根目录的 [.webpackrc](https://github.com/ant-design/ant-design-pro/blob/b7e7983661eb5e53dc807452e9653e93e74276d4/.webpackrc.js#L18)（roadhog）或 [config/config.js](https://github.com/ant-design/ant-design-pro/blob/56e648ec14bdb9f6724169fd64830447e224ccb1/config/config.js#L45)（Umi）文件中 `theme` 字段进行主题配置。`theme` 可以配置为一个对象或文件路径。
 
 ```js
 "theme": {
@@ -77,7 +77,7 @@ module.exports = {
 },
 ```
 
-或者 [一个 js 文件](https://github.com/ant-design/ant-design-pro/blob/3c2a056ef0dac06ce3b4389192691bb1f5c448e2/.webpackrc.js#L19)：
+或者 [一个 js 文件](https://github.com/ant-design/ant-design-pro/blob/b7e7983661eb5e53dc807452e9653e93e74276d4/.webpackrc.js#L18)：
 
 ```js
 "theme": "./theme.js",