Fix list that doesn't render properly

doc/install/docker.md

@@ -7,9 +7,10 @@ GitLab provides official Docker images to allowing you to easily take advantage
 ## Omnibus GitLab based images
 
 GitLab maintains a set of [official Docker images](https://hub.docker.com/r/gitlab) based on our [Omnibus GitLab package](https://docs.gitlab.com/omnibus/README.html). These images include:
-* [GitLab Community Edition](https://hub.docker.com/r/gitlab/gitlab-ce/)
-* [GitLab Enterprise Edition](https://hub.docker.com/r/gitlab/gitlab-ee/)
-* [GitLab Runner](https://hub.docker.com/r/gitlab/gitlab-runner/)
+
+- [GitLab Community Edition](https://hub.docker.com/r/gitlab/gitlab-ce/).
+- [GitLab Enterprise Edition](https://hub.docker.com/r/gitlab/gitlab-ee/).
+- [GitLab Runner](https://hub.docker.com/r/gitlab/gitlab-runner/).
 
 A [complete usage guide](https://docs.gitlab.com/omnibus/docker/) to these images is available, as well as the [Dockerfile used for building the images](https://gitlab.com/gitlab-org/omnibus-gitlab/tree/master/docker).