Latest update and remove TLSv1.3 draft

doc/man1/s_client.pod

@@ -102,6 +102,7 @@ B<openssl> B<s_client>
 [B<-dtls1>]
 [B<-dtls1_2>]
 [B<-sctp>]
+[B<-sctp_label_bug>]
 [B<-fallback_scsv>]
 [B<-async>]
 [B<-max_send_frag>]
@@ -506,6 +507,14 @@ Use SCTP for the transport protocol instead of UDP in DTLS. Must be used in
 conjunction with B<-dtls>, B<-dtls1> or B<-dtls1_2>. This option is only
 available where OpenSSL has support for SCTP enabled.
 
+=item B<-sctp_label_bug>
+
+Use the incorrect behaviour of older OpenSSL implementations when computing
+endpoint-pair shared secrets for DTLS/SCTP. This allows communication with
+older broken implementations but breaks interoperability with correct
+implementations. Must be used in conjunction with B<-sctp>. This option is only
+available where OpenSSL has support for SCTP enabled.
+
 =item B<-fallback_scsv>
 
 Send TLS_FALLBACK_SCSV in the ClientHello.