Merge branch 'gy-fix-50k-cnh-sidekiq-count-docs' into 'master'

Fix suggested Sidekiq pod count for 1000 RPS RA

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/168370



Merged-by: Brendan Lynch <blynch@gitlab.com>
Approved-by: Brendan Lynch <blynch@gitlab.com>
Co-authored-by: Grant Young <gyoung@gitlab.com>