Update eherkenning docs #14979

Job	Run time
Run the Django test suite	8m 33s
Run the Django test suite in reverse	5m 39s
Set up docker build 'dynamic' env variables	1s
Build and check documentation	3m 57s
End-to-end tests, chromium	13m 25s
End-to-end tests, firefox	16m 25s
End-to-end tests, webkit	12m 11s
docker_build (production) / Build image	2m 42s
docker_build (extensions, token_exchange,prefill_haalcentraalhr, all-extensions-) / Build image	2m 56s
Scan docker image	2m 6s
Simulate upgrading instances (2.7.4)	1m 19s
Simulate upgrading instances (2.7.8)	1m 19s
Check for unexepected OAS changes	7s
Generate Postman collection from OAS	12s
Validate OAS	13s
Generate SDKs from OAS	30s
Push Docker image	0s
update-docker-readme	0s
	1h 11m 35s

Provide feedback