doc: define optional parts in seq release diagram
doc: define optional parts in seq release diagram
checkstyle/contribution,checkstyle/contribution,checkstyle/contribution,rnveach/contribution,rnveach/contribution,rnveach/contribution,checkstyle/contribution,checkstyle/contribution,rnveach/contribution,rnveach/contribution,rnveach/contribution,checkstyle/contribution,checkstyle/contribution,rnveach/contribution