[BUG]kb configure -h Error in sample code

[dengkailu]

`Examples:

update component params

kbcli cluster configure mycluster --component=mysql --config-spec=mysql-3node-tpl --config-file=my.cnf --set
max_connections=1000,general_log=OFF`

[ldming]

@dengkailu Would you like to try to fix it? Fell free to submit a PR.