feat: added npm2yarn package (#1347)

docs/content/add-plugins/s3.md

@@ -51,8 +51,8 @@ Upon successfull creation of the user, you are presented with an **Access key ID
 
 First, install the plugin using your preferred package manager:
 
-```
-yarn add medusa-file-s3
+```bash npm2yarn
+npm install medusa-file-s3
 ```
 
 Then configure your `medusa-config.js` to include the plugin alongside the required options: