resources: Update broken links in README.md files

Change-Id: I0008980cbb34d9836ca08a63ed743f8997a4197b
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5-resources/+/36735
Reviewed-by: Bobby R. Bruce <bbruce@ucdavis.edu>
Maintainer: Bobby R. Bruce <bbruce@ucdavis.edu>
Tested-by: Bobby R. Bruce <bbruce@ucdavis.edu>
5 files changed
tree: c08d8b5c6e008461eae4071baf0f5d43c34a0a70
  1. README.md
  2. src/