Merge branch 'docs/ci-runner-service-variables' into 'master'

Docs: Add runner version for Variable setting in CI services

See merge request gitlab-org/gitlab!79621

doc/ci/services/index.md

@@ -260,10 +260,12 @@ test:
 | `entrypoint` | no     | 9.4 |Command or script to execute as the container's entrypoint. It's translated to Docker's `--entrypoint` option while creating the container. The syntax is similar to [`Dockerfile`'s `ENTRYPOINT`](https://docs.docker.com/engine/reference/builder/#entrypoint) directive, where each shell token is a separate string in the array. |
 | `command`    | no       | 9.4 |Command or script that should be used as the container's command. It's translated to arguments passed to Docker after the image's name. The syntax is similar to [`Dockerfile`'s `CMD`](https://docs.docker.com/engine/reference/builder/#cmd) directive, where each shell token is a separate string in the array. |
 | `alias` (1)     | no       | 9.4 | Additional alias that can be used to access the service from the job's container. Read [Accessing the services](#accessing-the-services) for more information. |
-| `variables`     | no       | 14.5 | Additional environment variables that are passed exclusively to the service. The syntax is the same as [Job Variables](../variables/index.md). |
+| `variables` (2)     | no       | 14.5 | Additional environment variables that are passed exclusively to the service. The syntax is the same as [Job Variables](../variables/index.md). |
 
 (1) Alias support for the Kubernetes executor was [introduced](https://gitlab.com/gitlab-org/gitlab-runner/-/issues/2229) in GitLab Runner 12.8, and is only available for Kubernetes version 1.7 or later.
 
+(2) Service variables support for the Docker and the Kubernetes executor was [introduced](https://gitlab.com/gitlab-org/gitlab-runner/-/merge_requests/3158) in GitLab Runner 14.8.
+
 ## Starting multiple services from the same image
 
 > Introduced in GitLab and GitLab Runner 9.4. Read more about the [extended configuration options](../docker/using_docker_images.md#extended-docker-configuration-options).