Merge pull request #14840 from inokawa/patch-1

Remove unused import from snippet

docs/snippets/common/storybook-main-using-existing-config.js.mdx

@@ -1,8 +1,6 @@
 ```js
 // .storybook/main.js
 
-const path = require('path');
-
 // your app's webpack.config.js
 const custom = require('../webpack.config.js');
 
@@ -11,4 +9,4 @@ module.exports = {
     return { ...config, module: { ...config.module, rules: custom.module.rules } };
   },
 };
-```
+```