Missing example for file request with cy.request()

Example curl:
```
curl -X POST \
  https://localhost:8080/api/action/upload_file
  -H 'Authorization: Bearer some token' 
  -H 'Content-type: multipart/form-data; boundary=----WebKitFormBoundary7MA4YWxkTrZu0gW'
  -F file=@/Users/Me/Documents/image.png
```

Is such action even supported? Could you please add an example of such request?
