[docs] Error in [Writing a new service]

[arturomsoberanes]

What is the URL of the page?

https://moodledev.io/docs/4.1/apis/subsystems/external/writing-a-service

What is the issue with this page?

I'm working with moodle version 4.1.5 and i was making a new external service but in the docs show how create a new Web Service using namespaces and in the section "Write the external function descriptions" you are still using the require_once for the externallib.php file, and if we try to use it, doesn't work.
By the way i love the new moodle devdocs ❤️

Are you able to provide a patch for this?

Yes - I will create one