website: Code discrepancies and other edits

Fixed discrepancies between code on Github
and tutorial, fixed unclear explanations.

Jira Issue: https://gem5.atlassian.net/browse/GEM5-690

Change-Id: Ia108329fb293c693eda19994c6c6f04aa92de80e
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5-website/+/31454
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: Jason Lowe-Power <power.jg@gmail.com>
3 files changed