[fix] remove some internal urls and emails

unittest/sql/resolver/sql/test_resolver_join_on.test

@@ -8,7 +8,7 @@ select * from t1 left join (t2 left join t3 on d+1=e) on t1.b=t3.b;
 select * from t1 left join (t2 left join t3 on d+1=b) on t1.b=t3.b;
 select * from t1 left join (t2 left join t3 on c+1=b) on t1.b=t3.b;
 
-# http://k3.alibaba-inc.com/issue/6347852?stat=1.5.1&toPage=1&versionId=1043693
+#
 create table t_1 (a1 int, a2 int);
 create table t_2 (a1 int, b int);
 create table t_3 (c1 int, c2 int);