Merge branch 'docs-add-timeout-option-pg-upgrade' into 'master'

Mention timeout option for pg-upgrade command

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/150500



Merged-by: Achilleas Pipinellis <axil@gitlab.com>
Approved-by: Balasankar 'Balu' C <balasankar@gitlab.com>
Approved-by: Achilleas Pipinellis <axil@gitlab.com>
Co-authored-by: Nailia Iskhakova <niskhakova@gitlab.com>