Update s_client doc adding xmpp as value for -starttls

CLA: trivial

Reviewed-by: Andy Polyakov <appro@openssl.org>
Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/5407)

diff --git a/doc/apps/s_client.pod b/doc/apps/s_client.pod
index d9413a0cf211e5b59ab6493e67b9d104339c9188..d2cad29d218b3022e47cc076f5fc6efd858e49dc 100644 (file)
--- a/doc/apps/s_client.pod
+++ b/doc/apps/s_client.pod
@@ -250,7 +250,7 @@ use the server's cipher preferences; only used for SSLV2.
 
 send the protocol-specific message(s) to switch to TLS for communication.
 B<protocol> is a keyword for the intended protocol.  Currently, the only
-supported keywords are "smtp", "pop3", "imap", and "ftp".
+supported keywords are "smtp", "pop3", "imap", "ftp" and "xmpp".
 
 =item B<-tlsextdebug>