更新 c5_docker运行mysql.md

c5_docker运行mysql.md

@@ -12,7 +12,7 @@ sudo docker rmi swr.cn-north-4.myhuaweicloud.com/ddn-k8s/docker.io/mysql:5.6.51
 ```
 sudo docker run -d \
   --name mysql-5.6.51 \
-  -e MYSQL_ROOT_PASSWORD=Dubhedi_Haerbin@#0822 \
+  -e MYSQL_ROOT_PASSWORD=123456 \
   -p 3306:3306 \
   mysql:5.6.51
 ```