Native setup Sidekiq docs out of date

[nihil2501]

https://github.com/department-of-veterans-affairs/vets-api/blob/master/docs/setup/native.md?plain=1#L40 is a link that 404s and should be replaced with https://github.com/department-of-veterans-affairs/va.gov-team-sensitive/blob/master/platform/engineering/sidekiq-enterprise-setup.md