website: Fixed broken Dockerfile links

These links, in the Building documentation, all had a trailing '>'
included by accident. This has been fixed.

Change-Id: Ie40883992008b807c0c324b09d78e0a970679070
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5-website/+/29994
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