update handbook with GitLab.com availability for June 2021 (!86569) · Merge requests · GitLab.com / www-gitlab-com · GitLab

Steve Loyd requested to merge sl-update-avail into master Jul 19, 2021

Why is this change being made?

Update the handbook to add availability result for June 2021

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Added a description to this MR explaining the reasons for the proposed change, per [say-why-not-just-what][transparency]
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