Adding FQDN as option

[silversword411]

while noting the caveats of restart required to update DNS

[CLAassistant]

All committers have signed the CLA.

[johnmaguire]

Thanks for the contribution - unfortunately, the text is now out of date, as FQDNs will be re-resolved periodically. (#796)

Going to close this out for now, but we'd consider accepting a PR that simply mentions a DNS hostname can be used. (If I remember to get around to it, I might toss one up.)