Documentation/eth/intel: Update address for driver support

Update the email address for support to use Intel Wired LAN, the mailing
list used for kernel development.

Suggested-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Reviewed-by: Jesse Brandeburg <jesse.brandeburg@intel.com>