Merge branch 'JonstonChan-fix-product-tier-badge-issue-boards' into 'master'

Docs: fix product tier badge in Issue board docs

See merge request gitlab-org/gitlab!69039

doc/user/project/issue_board.md

@@ -387,7 +387,7 @@ appears on the right. There you can see and edit the issue's:
 
 - Title
 - Assignees
-- Epic **PREMIUM**
+- Epic **(PREMIUM)**
 - Milestone
 - Time tracking value (view only)
 - Due date