website: Fixed broken boot-exit resource link

Change-Id: Ifd3d06bdb3826dccd96e5b0f6fc97e603f1021fb
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5-website/+/37736
Reviewed-by: Hoa Nguyen <hoanguyen@ucdavis.edu>
Reviewed-by: Bobby R. Bruce <bbruce@ucdavis.edu>
Maintainer: Bobby R. Bruce <bbruce@ucdavis.edu>
Tested-by: Bobby R. Bruce <bbruce@ucdavis.edu>
1 file changed