ast: correct comments (#2305) (#2306)
ast: correct comments (#2305) (#2306)


gaocegege/tidb,XuHuaiyu/tidb,c4pt0r/tidb,kyle-wang/tidb,c4pt0r/tidb,ngaut/tidb,cosmtrek/tidb,Nify/tidb,anywhy/tidb,ngaut/tidb,ming-relax/tidb,liyu4/tidb,pingcap/tidb,ueizhou/tidb,wusphinx/tidb,kyle-wang/tidb,kyle-wang/tidb,ngaut/tidb,pingcap/tidb,zs634134578/tidb,CodeRushing/tidb,ueizhou/tidb,qiuyesuifeng/tidb,liyu4/tidb,andelf/tidb,astaxie/tidb,ngaut/tidb,kyle-wang/tidb,simon-xia/tidb,qiuyesuifeng/tidb,mccxj/tidb,CodeRushing/tidb,pingcap/tidb,louishust/tidb,ming-relax/tidb,yuanwhy/tidb,anywhy/tidb,c4pt0r/tidb,spongedu/tidb,myrice/tidb,zs634134578/tidb,coocood/tidb,pingcap/tidb,coocood/tidb,Cofyc/tidb,EvilMcJerkface/tidb,yuanwhy/tidb,8cbx/tidb,myrice/tidb,ngaut/tidb,tiancaiamao/tidb,EvilMcJerkface/tidb,qhsong/tidb,zimulala/tidb,8cbx/tidb,Nify/tidb,andelf/tidb,wusphinx/tidb,astaxie/tidb,mccxj/tidb,ngaut/tidb,silenceper/tidb,c4pt0r/tidb,pingcap/tidb,zimulala/tidb,XuHuaiyu/tidb,cosmtrek/tidb,yangwenmai/tidb,pingcap/tidb,louishust/tidb,yangwenmai/tidb,silentred/tidb,spongedu/tidb,simon-xia/tidb,Cofyc/tidb,JinheLin/tidb,c4pt0r/tidb,c4pt0r/tidb,qhsong/tidb,silentred/tidb,JinheLin/tidb,tiancaiamao/tidb,kyle-wang/tidb,kyle-wang/tidb,silenceper/tidb,gaocegege/tidb