website: Fixed typo in learning gem5 part 1

Change-Id: Ib650d8bdc2029b6d5b3122ffeea79623075b77f2
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5-website/+/47841
Reviewed-by: Hoa Nguyen <hoanguyen@ucdavis.edu>
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>
1 file changed