Merge branch 'docs/group-issue-boards' into 'master'

Fix heading for group issue boards

See merge request gitlab-org/gitlab-ee!3028

doc/README.md

@@ -97,7 +97,7 @@ Manage your [repositories](user/project/repository/index.md) from the UI (user i
 - [Discussions](user/discussions/index.md) Threads, comments, and resolvable discussions in issues, commits, and  merge requests.
 - [Issues](user/project/issues/index.md)
 - [Project issue Board](user/project/issue_board.md)
-- **(EEP)** [Group Issue Boards](user/project/issue_board.md#group-level-issue-boards)
+- **(EEP)** [Group Issue Boards](user/project/issue_board.md#group-issue-boards)
 - **(EES/EEP)** [Related Issues](user/project/issues/related_issues.md): create a relationship between issues
 - [Issues and merge requests templates](user/project/description_templates.md): Create templates for submitting new issues and merge requests.
 - [Labels](user/project/labels.md): Categorize your issues or merge requests based on descriptive titles.

doc/user/project/issue_board.md

@@ -291,18 +291,18 @@ milestone with the due date that is next.
 
 ![Update boards milestone](img/issue_board_multiple_milestone.png)
 
-## Group-level issue boards
+## Group Issue Boards
 
 > Introduced in [GitLab Enterprise Edition 10.0 Premium](https://about.gitlab.com/2017/09/22/gitlab-10-0-released/#group-issue-boards).
 
-Group-level issue boards are analogous to project-level issue boards ans they are accessible at the group
+Group issue boards are analogous to project-level issue boards ans they are accessible at the group
 navigation level. A group-level issue board allows you to view all issues from all projects in that group
 (currently, it does not see issues from projects in subgroups). You can only associate group milestones
 and filter by group milestones for these boards. Similarly, you can only filter by group labels for these
 boards. When updating milestones and labels for an issue through the sidebar update mechanism, again only
 group-level objects are available.
 
-![Group-level issue board](img/group_issue_board.png)
+![Group issue board](img/group_issue_board.png)
 
 ## Focus mode