[SSSD] [sssd PR#988][opened] man: fix typos

[miztake]

URL: https://github.com/SSSD/sssd/pull/988
Author: miztake
 Title: #988: man: fix typos
Action: opened

PR body:
"""
 - add whitespace between words
 - correct manpage reference
 - correct wrong word
 - capitalize the first letter
"""

To pull the PR as Git branch:
git remote add ghsssd https://github.com/SSSD/sssd
git fetch ghsssd pull/988/head:pr988
git checkout pr988