kill命令应该显式标注在与被kill的会话在相同的TiDB Server上执行

File: /release-5.3/sql-statements/sql-statement-kill.md

这里修改查看会话信息的SQL，在kill命令之前添加连接TiDB的例子：
SELECT ID, USER, INSTANCE, INFO FROM INFORMATION_SCHEMA.CLUSTER_PROCESSLIST;
+---------------------+------+-----------------+-----------------------------------------------------------------------------+
| ID | USER | INSTANCE | INFO |
+---------------------+------+-----------------+-----------------------------------------------------------------------------+
| 1 | root | 127.0.0.1:10082 | select sleep(30), 'foo' |
| 2 | root | 127.0.0.1:10080 | select sleep(50) |
| 3 | root | 127.0.0.1:10080 | SELECT ID, USER, INSTANCE, INFO FROM INFORMATION_SCHEMA.CLUSTER_PROCESSLIST |
+---------------------+------+-----------------+-------------------------------------------------------------
2 rows in set (0.00 sec)
在与被kill会话相同 TiDB 节点上，执行 KILL TIDB 语句。
mysql -h127.0.0.1 -P10080 -uroot -p
KILL TIDB 3;
Query OK, 0 rows affected (0.00 sec)