[SSSD] [sssd PR#5588][comment] man: clarify single_prompt option

[alexey-tikhonov]

  URL: https://github.com/SSSD/sssd/pull/5588
Title: #5588: man: clarify single_prompt option

alexey-tikhonov commented:
"""
Thank you, ACK.
"""

See the full comment at https://github.com/SSSD/sssd/pull/5588#issuecomment-821135074