Hi hackers,
While investigating codes related with the permissions, I found the below
description in the pg_ctl.
```
-l filename
--log=filename
Append the server log output to filename. If the file does not exist, it is created. The umask is set to 077, so access
tothe log file is disallowed to other users by default.
```
But users who are in the same group can also see the log if group permissions are
enabled on the data directory. It was extended by c37b3d0 but updating the doc seemed
to be missed. Attached patch can fix the issue.
Best regards,
Hayato Kuroda
FUJITSU LIMITED
