Merge branch '10472-put-back-dind-executor-to-dast-ci-doc' into 'master'

Put back the Docker-in-Docker executor to DAST prerequisites in docs

Closes #10472

See merge request gitlab-org/gitlab-ee!10320

doc/ci/examples/dast.md

@@ -14,7 +14,7 @@ These examples show how to run DAST on your running web application by using Git
 ## Prerequisites
 
 To run a DAST job, you need GitLab Runner with
-[docker executor](https://docs.gitlab.com/runner/executors/docker.html).
+[docker-in-docker executor](https://docs.gitlab.com/runner/executors/docker.html#use-docker-in-docker-with-privileged-mode).
 
 ## Configuring with templates