Add REST API deprecation warning on Epics API docs
What does this MR do and why?
Add REST API deprecation warning on follow Epics API docs;
- https://docs.gitlab.com/ee/api/notes.html#epics
- https://docs.gitlab.com/ee/api/resource_label_events.html#epics
- https://docs.gitlab.com/ee/api/resource_state_events.html#epics
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Edited by Kushal Pandya