Update recommended amd64 hardware

The amd64 reference hardware page states the MinnowBoard Max is the
recommended hardware, but then lists 2 MinnowBoard Turbots in the table
below. Update the page to state the Turbot is the recommended hardware.

Signed-off-by: Martyn Welch <martyn.welch@collabora.com>

content/reference_hardware/amd64.md

@@ -7,7 +7,7 @@ title = "Intel 64-bit Reference Hardware"
 
 The recommended Intel 64-bit
 [reference hardware]( {{< ref "/reference_hardware/_index.md" >}} )
-is the Minnowboard Max. Please see its
+is the Minnowboard Turbot. Please see its
 [setup guide]( {{< ref "/reference_hardware/minnowboard_setup.md" >}} )
 for first-time setup.
 The following [optional extras]( {{< ref "/reference_hardware/extras.md" >}} )