Updated issue boards

The update includes the change to multiple issue boards that can have a milestone

doc/user/project/issue_board.md

@@ -172,6 +172,22 @@ existing one.
 
 ![Multiple issue boards](img/issue_boards_multiple.png)
 
+### Board with a milestone
+
+> Introduced in [GitLab Enterprise Edition][ee] 9.0.
+
+An issue board can be associated with a milestone which will automatically filter
+the issue to that milestone. This allows you to create unique boards for
+individual milestones.
+
+You can assign a milestone to a board by when creating a new issue board or you
+can update current issue boards to also have a milestone. There are also two
+pre-defined milestones, **Any milestone** and **Upcoming**. **Any milestone**
+will filter the issues with any milestone. **Upcoming** will filter issues to
+the milestone with the due date that is next.
+
+![Update boards milestone](img/issue_board_multiple_milestone.png)
+
 ## Permissions
 
 [Developers and up](../permissions.md) can use all the functionality of the