Update administration/maintenance_mode/index.md

Removed tier from version histories as mentioned in the styleguide

Update administration/maintenance_mode/index.md
Removed tier from version histories as mentioned in the styleguide
c5b5aade · Niklas van Schrick · 40d52e0f · c5b5aade
Commit c5b5aade authored Sep 02, 2021 by Niklas van Schrick
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 # GitLab Maintenance Mode **(PREMIUM SELF)**

-> [Introduced](https://gitlab.com/groups/gitlab-org/-/epics/2149) in GitLab Premium 13.9.
+> [Introduced](https://gitlab.com/groups/gitlab-org/-/epics/2149) in GitLab 13.9.

 Maintenance Mode allows administrators to reduce write operations to a minimum while maintenance tasks are performed. The main goal is to block all external actions that change the internal state, including the PostgreSQL database, but especially files, Git repositories, Container repositories, and so on.