Improve documentation related to Authentication Request with a temporary token

[bigludo7]

Problem description
Current yaml documentation for Authentication Request with a temporary token describe a CIBA Authentication Request while in ICM another flow is proposed (jwt bearer flow) and can fit for this API.
This restriction is inexact & could confusing for developer

Expected action
Update the documentation to be more generic and point to the ICM documentation for possible flow & detail.

Additional context

[bigludo7]

Fixed in #206