docs: update reference from Jira to GitHub issues
docs: update reference from Jira to GitHub issues

groybal/uPortal,ChristianMurphy/uPortal,Jasig/uPortal,Jasig/uPortal,groybal/uPortal,Jasig/uPortal,ChristianMurphy/uPortal,cousquer/uPortal,cousquer/uPortal,groybal/uPortal,mgillian/uPortal,cousquer/uPortal,ChristianMurphy/uPortal,bjagg/uPortal,groybal/uPortal,jonathanmtran/uPortal,groybal/uPortal,mgillian/uPortal,bjagg/uPortal,mgillian/uPortal,jonathanmtran/uPortal,jonathanmtran/uPortal,bjagg/uPortal