Move the gitlab-docs project under gitlab-org

Achilleas Pipinellisrequested to merge
rename-gitlab-docs-repo into master

What does this MR do?

Replaces gitlab-com/gitlab-docs with gitlab-org/gitlab-docs now that we transferred the project under gitlab-org. Part of https://gitlab.com/gitlab-com/gitlab-docs/issues/310

Edited by Achilleas Pipinellis

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