markdown: add regex pattern of autolink for commit hash
markdown: add regex pattern of autolink for commit hash

doortts/forked-for-history,oolso/yobi,naver/yobi,Limseunghwan/oss,ChangsungKim/TestRepository01,oolso/yobi,bloodybear/yona,naver/yobi,brainagenet/yobi,Limseunghwan/oss,doortts/fork-yobi,violetag/demo,bloodybear/yona,yona-projects/yona,ihoneymon/yobi,yona-projects/yona,yona-projects/yona,naver/yobi,ahb0327/yobi,ihoneymon/yobi,ahb0327/yobi,bloodybear/yona,Limseunghwan/oss,brainagenet/yobi,brainagenet/yobi,oolso/yobi,doortts/forked-for-history,doortts/fork-yobi,bloodybear/yona,doortts/forked-for-history,yona-projects/yona,violetag/demo,doortts/fork-yobi,ihoneymon/yobi,doortts/fork-yobi,ChangsungKim/TestRepository01,ahb0327/yobi