Instead of using the same MCU feature table in every board documentation, it refers to the MCU documentation. This makes it easier to maintain the MCU feature table.
According to the datasheet, SX1278 covers frequencies till 525MHz
and hence, cannot be used for the 868/915 MHz band. So swap both
chips.
Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>
