clarify wording for unique hostnames (#219)

arednGettingStarted/advanced_config.rst

@@ -190,7 +190,7 @@ In ``Direct`` mode the LAN hosts are directly accessible from the mesh since no
 DHCP Address Reservations
   If your node has its DHCP server enabled, it will automatically provide IP addresses to connected hosts. Look under the **Current DHCP Leases** heading to see the existing hosts and their assigned IP addresses.
 
-  .. attention:: The hostnames of computers connected to the mesh at large must be unique. Typically you should prefix your amateur radio callsign to the computer's hostname in order to have the best chance of it being unique on the mesh network.
+  .. attention:: The hostnames of every device connected to the mesh at large must be unique. It is best practice to prefix your Amateur Radio callsign to the hostname of each of your devices in order to have the best chance of it being unique on the mesh network.
 
   Since DHCP leases are dynamic and can change over time, there may be a reason why a host's assigned IP address should be made permanent. This is especially useful if that host will provide an application, program, or service through your node to the mesh network at large. You can permanently reserve that host's DHCP address by clicking the *Add* button at the right of the row in the *Current DHCP Leases* list. You will see that host now appears in the list under the **DHCP Address Reservations** heading above the list of leases.