[SSSD] [sssd PR#324][comment] MAN: Improve description of 'trusted domain section' in sssd.conf's man page

[centos-ci]

URL: https://github.com/SSSD/sssd/pull/324
Title: #324: MAN: Improve description of 'trusted domain section' in sssd.conf's man page

centos-ci commented:
"""
Can one of the admins verify this patch?
"""

See the full comment at https://github.com/SSSD/sssd/pull/324#issuecomment-315735343