net: txgbe: Update support email address

Update new email address for Wangxun 10Gb NIC support team.
Signed-off-by: Jiawen Wu <jiawenwu@trustnetic.com>
Link: https://lore.kernel.org/r/20230208023035.3371250-1-jiawenwu@trustnetic.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

Documentation/networking/device_drivers/ethernet/wangxun/txgbe.rst

@@ -16,5 +16,5 @@ Contents
 
 Support
 =======
-If you got any problem, contact Wangxun support team via support@trustnetic.com
+If you got any problem, contact Wangxun support team via nic-support@net-swift.com
 and Cc: netdev.