e1000: Added driver comments and whitespace changes. Modified long lines of...

e1000: Added driver comments and whitespace changes.  Modified long lines of code to ensure they would not wrap beyond 80 characters.


Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: John Ronciak <john.ronciak@intel.com>