website: Update stdlib tutorial for v22.0

Change-Id: Iddd008b25cba4b391ca9f19f31bf515330c7044e
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5-website/+/60515
Tested-by: Bobby Bruce <bbruce@ucdavis.edu>
Reviewed-by: Bobby Bruce <bbruce@ucdavis.edu>
Maintainer: Bobby Bruce <bbruce@ucdavis.edu>
3 files changed