Many thanks to Shockk for this patch.
References commits:
- 15dc12b76e76c6fa2ead773b6b40965223ad453f - Added snotes for failed SASL authentication attempts if need_sasl flag is set.
- febd2e2aca27f7f1acfc522f3fda65d8be067edc - Updated help/opers/snomask to add +S snomask.