net: broadcom: Fix manufacturer name in Kconfig help text

The help text refers to AMD instead of Broadcom, presumably because it
was copied from the former.

Fixes: adfc5217 ("broadcom: Move the Broadcom drivers")
Signed-off-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/broadcom/Kconfig

@@ -14,9 +14,9 @@ config NET_VENDOR_BROADCOM
 	  say Y.
 
 	  Note that the answer to this question does not directly affect
-	  the kernel: saying N will just case the configurator to skip all
-	  the questions regarding AMD chipsets. If you say Y, you will be asked
-	  for your specific chipset/driver in the following questions.
+	  the kernel: saying N will just cause the configurator to skip all
+	  the questions regarding Broadcom chipsets. If you say Y, you will
+	  be asked for your specific chipset/driver in the following questions.
 
 if NET_VENDOR_BROADCOM