[Markdown] Fix regex to not be overly greedy.
[Markdown] Fix regex to not be overly greedy.

hwthomas/xwt,steffenWi/xwt,lytico/xwt,cra0zy/xwt,hamekoz/xwt,TheBrainTech/xwt,antmicro/xwt,iainx/xwt,mminns/xwt,akrisiun/xwt,mono/xwt,residuum/xwt,mminns/xwt,sevoku/xwt,directhex/xwt