docs/install/docker.md: fix register command (!22) · Merge requests · GitLab.org / gitlab-runner · GitLab

Do not update/delete: Banner broadcast message test data

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username-removed-130415 requested to merge higebu/gitlab-ci-multi-runner:fix-docker-exec-command into master Aug 11, 2015

Fix register command from gitlab-runner to gitlab-ci-multi-runner in docker document.