Merge branch 'docs-update-table-tiers-boards' into 'master'

Docs update table tiers boards

See merge request gitlab-org/gitlab-ce!17651

doc/user/project/issue_board.md

@@ -245,6 +245,17 @@ navigation level. A group-level issue board allows you to view all issues from a
 boards. When updating milestones and labels for an issue through the sidebar update mechanism, again only
 group-level objects are available.
 
+## Features per tier
+
+Different issue board features are available in different [GitLab tiers](https://about.gitlab.com/pricing/), as shown in the following table:
+
+| Tier | Number of project issue boards | Board with configuration in project issue boards | Number of group issue boards | Board with configuration in group issue boards |
+| --- | --- | --- | --- | --- |
+| Libre    | 1        | No  | 1        | No  |
+| Starter  | Multiple | Yes | 1        | No  |
+| Premium  | Multiple | Yes | Multiple | Yes |
+| Ultimate | Multiple | Yes | Multiple | Yes |
+
 ## Tips
 
 A few things to remember: