website: Fix some typos in the website README.

Change-Id: I13df66c3c90c8372a55ef326ee62a8ed9336f09f
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5-website/+/40117
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