snmpm: documentation bug

[Vance Shipley]

It would be nice if snmp:passwd2localized_key/3 were documented too.

The User's Guide doesn't tell you what goes into the authentication
keys.  I eventually learned that you need to take the passphrase from
the manager and run it through:

   snmp:passwd2localized_key(md5, PassPhrase, AgentEngineID)

The result is a list of 16 integers to be used as the key in usm.conf.

This may be a general SNMP thing but it would be helpful if it was
mentioned in the UG and man page.

	-Vance