docs:monitor: Fill in monitor_start_delay attribute details

The `monitor_start_delay` attribute contains the amount of time(in
seconds) to delay from monitoring the fan at the start of powering on
the system. This defaults to 0, meaning the fan will immediately be
monitored according to its configuration at the start of power on.

Signed-off-by: Matthew Barth <msbarth@us.ibm.com>
Change-Id: Id190723589ee7ffe8bdcc591306c36e3d4554128
1 file changed