[DOCS] The reference to 'atacontrol' on FreeBSD is outdated.

The following documentation comment has been logged on the website:

Page: https://www.postgresql.org/docs/9.6/static/wal-reliability.html
Description:

Hi,

On this page:
https://www.postgresql.org/docs/9.6/static/wal-reliability.html

... there is a reference to 'atacontrol' on FreeBSD: 'On FreeBSD, IDE drives
can be queried using atacontrol...'

This command was deprecated in FreeBSD 9.0 which was released in January
2012. Here is a link to the relevant man page highlighting its obsolesence:
https://www.freebsd.org/cgi/man.cgi?query=atacontrol&sektion=8&apropos=0&manpath=FreeBSD+9.0-RELEASE

The 'camcontrol' is the replacement.

Thanks,
J.