Remove duplicated curl from the PATCH example

[coleplx]

There was a duplicated curl in the last example.

Also... it could be worth to mention that sending a PATCH to change ANY "settings" value will reset all other values. But that's up to you. ;)

For example: Before:

      "settings": {
        "min_tls_version": "1.2"
      },

After:

      "settings": {
        "early_hints": "on"
      },