docs: networking: device drivers: flexcan: fix invalid email

The Amarula contact info email address is wrong, so fix it up to use the
correct one.
Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
Link: https://lore.kernel.org/all/20220828134442.794990-1-dario.binacchi@amarulasolutions.comSigned-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

Documentation/networking/device_drivers/can/freescale/flexcan.rst

@@ -5,7 +5,7 @@ Flexcan CAN Controller driver
 =============================
 
 Authors: Marc Kleine-Budde <mkl@pengutronix.de>,
-Dario Binacchi <dario.binacchi@amarula.solutions.com>
+Dario Binacchi <dario.binacchi@amarulasolutions.com>
 
 On/off RTR frames reception
 ===========================