[FEATURE REQ] Document https://management.azure.com/batch

[Klaas-]

API Spec link

None yet

API Spec version

2020-06-01

Please describe the feature.

I could not find where the batch endpoint is documented in the rest api specs, so please document it. It's being used extensively by portal, ansible, etc but I could not locate official docs by msft on it.

curl 'https://management.azure.com/batch?api-version=2020-06-01'
-H 'accept: /'
-H 'accept-language: en'
-H 'authorization: Bearer ....
-H 'content-type: application/json'
--data-raw $'{"requests":[{...}]'

I've seen discussion in sdks about using it, but sofar they do not do it because it's not available in the rest api specs:
Azure/azure-sdk-for-go#23799
Azure/azure-sdk-for-go#17155
Azure/azure-sdk-for-go#15957
Azure/azure-sdk-for-python#9271
Azure/autorest.typescript#34