docs: update demo links

components/select/index.en-US.md

@@ -98,4 +98,4 @@ Select component to select value from options.
 
 ### The dropdown is closed when click `dropdownRender` area?
 
-See the [dropdownRender example](/components/select/#components-select-demo-custom-dropdown-menu).
+See the instruction in [dropdownRender example](#components-select-demo-custom-dropdown-menu).

components/select/index.zh-CN.md

@@ -101,4 +101,4 @@ title: Select
 
 ### 点击 `dropdownRender` 里的内容浮层关闭怎么办？
 
-看下 [dropdownRender 例子](/components/select/#components-select-demo-custom-dropdown-menu) 里的说明。
+看下 [dropdownRender 例子](#components-select-demo-custom-dropdown-menu) 里的说明。