downgrade mention of login.conf to be an example and mention PAM as
another provider for ChallengeResponseAuthentication; bz#1408; ok dtucker@
diff --git a/sshd_config.5 b/sshd_config.5
index 29f4d82..588aed5 100644
--- a/sshd_config.5
+++ b/sshd_config.5
@@ -176,10 +176,9 @@
This option is only available for protocol version 2.
By default, no banner is displayed.
.It Cm ChallengeResponseAuthentication
-Specifies whether challenge-response authentication is allowed.
-All authentication styles from
-.Xr login.conf 5
-are supported.
+Specifies whether challenge-response authentication is allowed (e.g. via
+PAM or though authentication styles supported in
+.Xr login.conf 5 )
The default is
.Dq yes .
.It Cm ChrootDirectory