origin-sets are equivalent to the global roa-set. As with roa-set the
maxlen argument is optional so copy the roa-set markup to origin-set.

Old output:
    origin-set name { address/len maxlen mlen source-as asn ... }
New output:
    origin-set name { address/len [maxlen mlen] source-as asn ... }

-- 
:wq Claudio

Index: bgpd.conf.5
===================================================================
RCS file: /cvs/src/usr.sbin/bgpd/bgpd.conf.5,v
diff -u -p -r1.237 bgpd.conf.5
--- bgpd.conf.5	13 Oct 2023 07:37:35 -0000	1.237
+++ bgpd.conf.5	15 Mar 2024 07:39:32 -0000
@@ -473,7 +473,9 @@ aspa-set {
 .Pp
 .It Xo
 .Ic origin-set Ar name
-.Ic { Ar address Ns Li / Ns Ar len Ic maxlen Ar mlen Ic source-as Ar asn ... Ic }
+.Ic { Ar address Ns Li / Ns Ar len
+.Op Ic maxlen Ar mlen
+.Ic source-as Ar asn ... Ic }
 .Xc
 An
 .Ic origin-set