From the context it seems that the function being defined is authenticate_none.

Signed-off-by: Jan Pazdziora <jpazdziora@redhat.com>
Reviewed-by: Andreas Schneider <asn@cryptomilk.org>

doc/authentication.dox

@@ -281,7 +281,7 @@ pass, ssh_userauth_none() might answer SSH_AUTH_SUCCESS.
 The following example shows how to perform "none" authentication:
 
 @code
-int authenticate_kbdint(ssh_session session)
+int authenticate_none(ssh_session session)
 {
   int rc;