fix: Unused variable, import, function or class (#685)

Author: afc163

docs/examples/debug.tsx

@@ -117,7 +117,7 @@ export default () => {
           onClick={onRootClick}
           defaultMotions={motionMap}
           inlineCollapsed={inlineCollapsed}
-          // openKeys={openKeys}
+          openKeys={openKeys}
           onOpenChange={newOpenKeys => setOpenKeys(newOpenKeys)}
         >
           <Menu.Item key="mail">

docs/examples/single.tsx

@@ -1,7 +1,7 @@
 /* eslint no-console:0 */
 
 import React from 'react';
-import Menu, { SubMenu, Item as MenuItem, Divider } from 'rc-menu';
+import Menu from 'rc-menu';
 import '../../assets/index.less';
 
 const menu1List = [
@@ -50,7 +50,7 @@ export default () => (
   <Menu
   selectable={false}
   mode="inline"
-  defaultOpenKeys={"Resources"}
+  defaultOpenKeys={['Resources']}
   style={{ width: "100%" }}
   items={menu1Items(menu1List)}
 />