Docs: Update repo directory for update keys after expiration
See merge request https://gitlab.com/gitlab-org/omnibus-gitlab/-/merge_requests/7510
Merged-by: Marcin Sedlak-Jakubowski <msedlakjakubowski@gitlab.com>
Approved-by: Axel von Bertoldi <avonbertoldi@gitlab.com>
Approved-by: Marcin Sedlak-Jakubowski <msedlakjakubowski@gitlab.com>
Reviewed-by: alexgit2k <utaker2k-git@yahoo.de>
Co-authored-by: fneill <fneill@gitlab.com>