igc: fix typos in comments

igc: fix typos in comments

Fix spelling errors in code comments:
 - igc_diag.c: 'autonegotioation' -> 'autonegotiation'
 - igc_main.c: 'revisons' -> 'revisions' (two occurrences)

Signed-off-by: Maximilian Pezzullo <maximilianpezzullo@gmail.com>
Reviewed-by: Aleksandr Loktionov <aleksandr.loktionov@intel.com>
Reviewed-by: Joe Damato <joe@dama.to>
Tested-by: Avigail Dahan <avigailx.dahan@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Link: https://patch.msgid.link/20260609213559.178657-16-anthony.l.nguyen@intel.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>