dhcrelay: change the description and help text to make it clear multiple servers are supported (#1360)
dhcrelay: change the description and help text to make it clear multiple servers are supported (#1360)

* dhcrelay: change the description and help text to make it clear multiple servers are supported

* dhcrelay: minor spelling errors

opnsense/core,opnsense/core,opnsense/core,opnsense/core,opnsense/core,opnsense/core