Update docs related to CloudConnector::AvailableServices
What does this MR do and why?
Extracted from !149840 (closed)
The goal is to update Cloud Connector docs to reflect the new CloudConnector::AvailableServices
interface.
Issue: https://gitlab.com/gitlab-org/gitlab/-/issues/458677
MR acceptance checklist
Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.
Related to #455562
Edited by Aleksei Lipniagov