Add conference to reviewer roulette guide
What does this MR do and why?
Adds the Conference
keyword reference as out of office for the reviewer roulette.
Related change https://gitlab.com/gitlab-org/gitlab-roulette/-/merge_requests/108+.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Edited by Jaime Martinez