Port number picker - add a note to user telling them they can type in port number

[JgrPPC]

PortAuthority/app/src/main/java/com/aaronjwood/portauthority/activity/WanHostActivity.java

Line 88 in 9dbc43e

NumberPicker portRangePickerStop = portRangeDialog.findViewById(R.id.portRangePickerStop);

I just realized I can type a number in the number wheel control!
I'd suggest letting the user know about this option! :)