* docs: add async interceptor documentation

* Update configuration.md

* feat: swagger 2.0 preauthorization methods
* tests: add cases for oas3 preauthorization
* docs: add new preauth docs; touch up existing auth docs
* tests: add `rootInject` tests
* docs: remove unfinished sentence

* feat: `onComplete` config option

* tests(e2e): add case for onComplete option

This change separates:
the Model (the one on the model-example section)
from
the Models (the ones at the bottom)

For #3830