Merge branch 'docs-api-notes-level' into 'master'

Update epic license level in api/notes.md

See merge request gitlab-org/gitlab!51451

doc/api/notes.md

@@ -11,7 +11,7 @@ Notes are comments on:
 - Snippets
 - Issues
 - Merge requests
-- Epics **(ULTIMATE)**
+- Epics **(PREMIUM)**
 
 This includes system notes, which are notes about changes to the object (for example, when an
 assignee changes, GitLab posts a system note).