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This bug is created as a clone of upstream ticket:
https://fedorahosted.org/freeipa/ticket/2745

Document difference between "Max lifetime (days)" in password policy and actual Kerberos Password Expiration time (i.e. krbPasswordExpiration attribute).

Copied from mailing list, see link below:
Documentation:
* Full meaning for this attribute krbPasswordExpiration
* The difference between Max lifetime (days) & krbPasswordExpiration
* How to change ldap expiration entries.

Details are on mailing list (including "change ldap expiration entries" part):
https://www.redhat.com/archives/freeipa-users/2012-May/msg00160.html

Added a section here:
http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html/Identity_Management_Guide/pwd-expiration.html

checked in:

http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html/Identity_Management_Guide/pwd-expiration.html

Red_Hat_Enterprise_Linux-Identity_Management_Guide-6-en-US-2.2.0-1

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11.4. Managing Password Expirations
Password policies are applied at the time a password is changed. So, when a password is set, it conforms to the password policy in effect at that time. If the password policy is changed later, that change is not applied, retroactively, to the password.

Setting password expiration periods is configured as part of the group password policy. Creating and editing password policies (including the expiration attribute in the policy) is covered in Section 11.3, “Creating and Editing Password Policies”.
With password expirations, there are two attibutes that are related: 

[typo] s/attibutes/attributes
[comment] Also after checking the AHD and IBM style guide there are no instances of Expirations, this should be replaced with Expiration.

Typos fixed.
http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html/Identity_Management_Guide/pwd-expiration.html