Fix optional revocation reason parameter for "protx revoke" and a few help strings (#2568)
Fix optional revocation reason parameter for "protx revoke" and a few help strings (#2568)

* Fix optional revocation reason parameter for "protx revoke"

* Fix "protx revoke" help message

* Remove obsolete help text about masternode operator keys and wallets

dashpay/dash,biblepay/biblepay,ionomy/ion,UdjinM6/dash,biblepay/biblepay,ionomy/ion,UdjinM6/dash,nmarley/dash,nmarley/dash,ionomy/ion,UdjinM6/dash,nmarley/dash,thelazier/dash,nmarley/dash,UdjinM6/dash,biblepay/biblepay,biblepay/biblepay,thelazier/dash,biblepay/biblepay,thelazier/dash,thelazier/dash,biblepay/biblepay,dashpay/dash,thelazier/dash,biblepay/biblepay,biblepay/biblepay,ionomy/ion,dashpay/dash,dashpay/dash,dashpay/dash,UdjinM6/dash,nmarley/dash,ionomy/ion,nmarley/dash,nmarley/dash,ionomy/ion