[sssd PR#911][opened] Update pam_sss.8.xml

[alexal]

   URL: https://github.com/SSSD/sssd/pull/911
Author: alexal
 Title: #911: Update pam_sss.8.xml
Action: opened

PR body:
"""
pam_sss: Added return values on a man page

Resolves: https://pagure.io/SSSD/sssd/issue/3672
"""

To pull the PR as Git branch:
git remote add ghsssd https://github.com/SSSD/sssd
git fetch ghsssd pull/911/head:pr911
git checkout pr911