fix a dead link (#7829)
fix a dead link (#7829)


pingcap/tidb,kyle-wang/tidb,pingcap/tidb,c4pt0r/tidb,kyle-wang/tidb,ngaut/tidb,ngaut/tidb,c4pt0r/tidb,cosmtrek/tidb,Cofyc/tidb,qiuyesuifeng/tidb,pingcap/tidb,XuHuaiyu/tidb,ngaut/tidb,qiuyesuifeng/tidb,ngaut/tidb,tiancaiamao/tidb,coocood/tidb,pingcap/tidb,pingcap/tidb,cosmtrek/tidb,c4pt0r/tidb,Cofyc/tidb,ming-relax/tidb,pingcap/tidb,ngaut/tidb,kyle-wang/tidb,mccxj/tidb,XuHuaiyu/tidb,c4pt0r/tidb,EvilMcJerkface/tidb,mccxj/tidb,kyle-wang/tidb,c4pt0r/tidb,coocood/tidb,c4pt0r/tidb,kyle-wang/tidb,tiancaiamao/tidb,kyle-wang/tidb,EvilMcJerkface/tidb,ming-relax/tidb,ngaut/tidb