add done: 20210915 How to check for update info and changelogs with rpm-ostree db.md
add done: 20210915 How to check for update info and changelogs with rpm-ostree db.md

chunyang-wen/TranslateProject,LCTT/TranslateProject,tnuoccalanosrep/TranslateProject,FSSlc/TranslateProject,Yinux/TranslateProject,bestony/TranslateProject