apiRoot description should match standard text #217

Problem description
code/API_definitions/webrtc-call-handling.yaml:234:22 — [S-023] apiRoot description does not match the standard CAMARA text.
code/API_definitions/webrtc-events-subscriptions.yaml:211:22 — [S-023] apiRoot description does not match the standard CAMARA text.
code/API_definitions/webrtc-registration.yaml:130:22 — [S-023] apiRoot description does not match the standard CAMARA text.

Expected behavior
Use standard text:

description: API root, defined by the service provider, e.g. `api.example.com` or `api.example.com/somepath`

Additional context
https://github.com/camaraproject/Commonalities/blob/r4.3/artifacts/api-templates/sample-service.yaml#L71-L76