Change Kconfig description

This patch apply Mellanox network vendor which includes:
- Mellanox card devices: ConnectX-4, ConnectX-5 and Connect-IB cards.
- Mellanox switch device: SwitchX-2 Switch-IB, Spectrum.
Therefore rephrasing help.
Signed-off-by: NOhad Oz <ohado@mellanox.com>
Acked-by: NLeon Romanovsky <leonro@mellanox.com>
Acked-by: NJiri Pirko <jiri@mellanox.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/mellanox/Kconfig

@@ -7,7 +7,8 @@ config NET_VENDOR_MELLANOX
 	default y
 	depends on PCI || I2C
 	---help---
-	  If you have a network (Ethernet) card belonging to this class, say Y.
+	  If you have a network (Ethernet or RDMA) device belonging to this
+	  class, say Y.
 
 	  Note that the answer to this question doesn't directly affect the
 	  kernel: saying N will just cause the configurator to skip all