MAN: Improve ipa_hostname description
The description of ipa_hostname config option doesn't mention it must be
fully-qualified, although when using a non-fully qualified name IPA
server may behave weirdly. Thus, let's add this info the the man page.
Related: https://pagure.io/SSSD/sssd/issue/1946
Reviewed-by: Fabiano FidĂȘncio <fidencio@redhat.com>
Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>