website: fix the wrong flag value

Fix the wrong --debug-flags in the Debugging gem5 section.

Change-Id: I1ede950f1a5b9bb29089acb4ee6d2b2223d49320
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5-website/+/60889
Reviewed-by: Bobby Bruce <bbruce@ucdavis.edu>
Reviewed-by: Hoa Nguyen <hoanguyen@ucdavis.edu>
Maintainer: Bobby Bruce <bbruce@ucdavis.edu>
Tested-by: Bobby Bruce <bbruce@ucdavis.edu>
1 file changed