Fix SAREGISTER short help in SAVERIFY command

irc/nickserv.go

 			help: `Syntax: $bSAVERIFY <username>$b
 
 SAVERIFY manually verifies an account that is pending verification.`,
-			helpShort: `$bSAREGISTER$b registers an account on someone else's behalf.`,
+			helpShort: `$bSAVERIFY$b manually verifies an account that is pending verification.`,
 			enabled:   servCmdRequiresAuthEnabled, // deliberate
 			capabs:    []string{"accreg"},
 			minParams: 1,