fixup! add devices.py --PORT <#> to disable others

unit-tests/py/rspy/devices.py

@@ -726,6 +726,10 @@ def get_phys_port(dev):
                 ports = [int(port) for port in str_ports if port.isnumeric() and int(port) in all_ports]
                 if len(ports) != len(str_ports):
                     log.f( 'Invalid ports', str_ports )
+                # With --port, leave other ports alone
+                # With --PORT, disable other ports
+                #       This would otherwise require --none, wait, --port)
+                #       Note that it does not recycle the port if it was already enabled
                 hub.enable_ports( ports, disable_other_ports=(opt == '--PORT') )
                 action = 'none'
             elif opt in ('--ports'):