Improve GitLab docs (#8775)

Co-authored-by: Eddú Meléndez <[email protected]>

Author: JapuDCret

docs/supported_docker_environment/continuous_integration/gitlab_ci.md

@@ -24,10 +24,10 @@ See below for an example runner configuration:
 Please also include the following in your GitlabCI pipeline definitions (`.gitlab-ci.yml`) that use Testcontainers:
 ```yml
 variables:
-  TESTCONTAINERS_HOST_OVERRIDE: "host.docker.internal"
+  TESTCONTAINERS_HOST_OVERRIDE: "<ip-docker-host>"
 ```
 
-The environment variable `TESTCONTAINERS_HOST_OVERRIDE` needs to be configured, otherwise, a wrong IP address would be used to resolve the Docker host, which will likely lead to failing tests.
+The environment variable `TESTCONTAINERS_HOST_OVERRIDE` needs to be configured, otherwise, a wrong IP address would be used to resolve the Docker host, which will likely lead to failing tests. For Windows and MacOS, use `host.docker.internal`.
 
 ## Example using DinD (Docker-in-Docker)