krb5.conf manpage update for RFC8009 enctypes

[DewayneG]

The manpage for krb5.conf contains only enctypes:
des-cbc-crc, des-cbc-md4, des-cbc-md5,
des3-cbc-sha1, arcfour-hmac-md5, aes128-cts-hmac-sha1-96, and
aes256-cts-hmac-sha1-96
while heimdal 7.7.0 clients offer to negotiate additional types
19 hmac-sha256-128-aes128 16 RFC 8009
20 hmac-sha384-192-aes256 24 RFC 8009
per rfc8009.

Would you please update the krb5.conf manpage to include:
aes256-cts-hmac-sha384-192, aes128-cts-hmac-sha256-128
to the existing statement:
"valid encryption types are: des-cbc-crc, des-cbc-md4, des-cbc-
md5, des3-cbc-sha1, arcfour-hmac-md5, aes128-cts-hmac-sha1-96,
and aes256-cts-hmac-sha1-96"

(My thanks to Benjamin Kaduk@FreeBSD for pointing me to both the RFC & to you).