i40e: fix a typo

This patch fixes a typo in i40e_vsi_alloc_arrays() documentation.
The first parameter name should be "vsi" instead of "type".

Signed-off-by: Rami Rosen <rami.rosen@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>