Update MAINTENANCE.md

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Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• API support added
• Tests added for this feature/bug
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  • Has been reviewed by UX
  • Has been reviewed by Frontend
  • Has been reviewed by Backend
  • Has been reviewed by Database
• Conform by the merge request performance guides
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• Squashed related commits together

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MAINTENANCE.md

@@ -16,10 +16,6 @@ The current stable release will receive security patches and bug fixes
 release where the minor version is increased numerically by increments of one
 (eg. `8.9 -> 8.10`).
-Our current policy is to support one stable release at any given time, but for
-medium-level security issues, we may consider [backporting to the previous two
-monthly releases][rel-sec].
-
 We encourage everyone to run the latest stable release to ensure that you can
 easily upgrade to the most secure and feature-rich GitLab experience. In order
 to make sure you can easily run the most recent stable release, we are working
@@ -33,3 +29,6 @@ More information about the release procedures can be found in our
 [rel]: https://gitlab.com/gitlab-org/release-tools/blob/master/doc/
 [disclosure]: https://about.gitlab.com/disclosure/
 [pragmatic way]: https://gist.github.com/jashkenas/cbd2b088e20279ae2c8e
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