[krbdev.mit.edu #5297] Docs - slave KDCs and host principals

[Jeff Blaine via RT]

http://web.mit.edu/Kerberos/krb5-1.5/krb5-1.5.1/doc/krb5-install/Create-Host-Keys-for-the-Slave-KDCs.html#Create%20Host%20Keys%20for%20the%20Slave%20KDCs

"Each KDC needs a host principal in the Kerberos database.
You can enter these from..."

Why?