Add locked accounts info

Cynthia "Arty" Ngrequested to merge
arty-locked-accounts into master

With lots of questions on how locked accounts can be unlocked, this should be documented for everyone in support.

Macro MR: https://gitlab.com/gitlab-com/support/support-ops/zendesk-global/macros/-/merge_requests/543

Edited by Cynthia "Arty" Ng

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