Update the gitlab chart kubernetes install documentation

With an updated list of the images you need to change when switching to
the CE version.

doc/install/kubernetes/gitlab_chart.md

@@ -123,6 +123,8 @@ To deploy the Community Edition, include these options in your `helm install` co
 --set gitlab.migrations.image.repository=registry.gitlab.com/gitlab-org/build/cng/gitlab-rails-ce
 --set gitlab.sidekiq.image.repository=registry.gitlab.com/gitlab-org/build/cng/gitlab-sidekiq-ce
 --set gitlab.unicorn.image.repository=registry.gitlab.com/gitlab-org/build/cng/gitlab-unicorn-ce
+--set gitlab.unicorn.workhorse.image=registry.gitlab.com/gitlab-org/build/cng/gitlab-workhorse-ce
+--set gitlab.task-runner.image.repository=registry.gitlab.com/gitlab-org/build/cng/gitlab-task-runner-ce
 ```
 
 ## Updating GitLab using the Helm Chart