Doc for update from 5.3 to 5.4
Doc for update from 5.3 to 5.4

ArthurHoaro/Public-GitLab,screenpages/gitlabhq,ArthurHoaro/Public-GitLab,screenpages/gitlabhq,screenpages/gitlabhq,ArthurHoaro/Public-GitLab,screenpages/gitlabhq