Point to the admin guide, which for whatever reason people don't know to
check for the list of recognized values.  The kdc_supported_enctypes
setting isn't used by anything, so while we're making edits, drop it.

diff -up krb5/src/config-files/kdc.conf.M krb5/src/config-files/kdc.conf.M
--- krb5/src/config-files/kdc.conf.M	2010-07-07 15:16:54.000000000 -0400
+++ krb5/src/config-files/kdc.conf.M	2010-07-07 15:17:28.000000000 -0400
@@ -238,10 +238,9 @@ this realm. 
 
 .IP supported_enctypes
 list of key:salt strings that specifies the default key/salt
-combinations of principals for this realm
-
-.IP kdc_supported_enctypes
-specifies the permitted key-salt combinations of principals for this realm
+combinations of principals for this realm.  The full list of supported
+encryption (key) and salt types can be found in the Kerberos V5 System
+Administrator's Guide.
 
 .IP reject_bad_transit
 this