Refactor issue boards
What does this MR do?
There were many issues with those docs, like duplicate headings, no titlecase, outdated images, etc.
Closes https://gitlab.com/gitlab-org/gitlab-ee/issues/6434
http://ee-docs-refactor-issue-boards-ee.178.62.207.141.xip.io/ee/user/project/issue_board.html
Edited by 🤖 GitLab Bot 🤖