manpages:samba-tool: sort 'service-account' into place alphabetically

Signed-off-by: Douglas Bagnall <[email protected]>
Reviewed-by: Rowland Penny <[email protected]>

Autobuild-User(master): Douglas Bagnall <[email protected]>
Autobuild-Date(master): Wed Mar 12 20:55:01 UTC 2025 on atb-devel-224

Author: douglasbagnall