Add mention of auto alerts in autodevops docs
What does this MR do?
Adds mention of automatic alerts as part of #118788 (closed).
Conformity
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Changelog entry -
Documentation (if required) -
Code review guidelines -
Merge request performance guidelines -
Style guides -
Database guides -
Separation of EE specific content
Closes #118788 (closed)
Edited by Rémy Coutable