Improve documentation for mysql-set_query_lock_on_hostgroup

[michaeldg]

Hi,

The documentation for 'mysql-set_query_lock_on_hostgroup' (https://proxysql.com/documentation/global-variables/mysql-variables/#mysql-set_query_lock_on_hostgroup) mentions that query routing is disable. If you know how ProxySQL works it is logical to understand that query routing means changing the destination host group. For beginners it could mean that query caching rules are disabled as well.

Please update the documentation so this is more clear :)
Or, make 'query routing' a link to somewhere in the documentation where the term is defined.

Thanks,
Michaël