Update doc/update/8.12-to-8.13.md
Update doc/update/8.12-to-8.13.md
iiet/iiet-git,stoplightio/gitlabhq,iiet/iiet-git,iiet/iiet-git,mmkassem/gitlabhq,mmkassem/gitlabhq,dreampet/gitlab,stoplightio/gitlabhq,axilleas/gitlabhq,iiet/iiet-git,axilleas/gitlabhq,stoplightio/gitlabhq,dreampet/gitlab,axilleas/gitlabhq,dreampet/gitlab,dreampet/gitlab,stoplightio/gitlabhq,mmkassem/gitlabhq,mmkassem/gitlabhq,axilleas/gitlabhq