Issue #534: enable markdown lint
Issue #534: enable markdown lint

checkstyle/contribution,rnveach/contribution,checkstyle/contribution,checkstyle/contribution,rnveach/contribution,checkstyle/contribution,rnveach/contribution,checkstyle/contribution,rnveach/contribution,checkstyle/contribution,rnveach/contribution,rnveach/contribution,checkstyle/contribution,rnveach/contribution