Merge branch 'docs-modify-sidekiq-docs' into 'master'

Add env-variables link to sidekiq config limits section

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/141272



Merged-by: Jon Glassman <jglassman@gitlab.com>
Approved-by: Jon Glassman <jglassman@gitlab.com>
Co-authored-by: Brenda Nyaringita <bnyaringita@gitlab.com>