A documentation error has been pointed out to us, in the Ambari Installation for Power Systems. (HDP 2.6.3).
The HDP-UTILS repo appears to be cited correctly in the "HDP 2.6 Repositories" section within Chapter 1, in the table.
However, later in the document, the "Select Version" section of Chapter 3 mentions the repo again but the URL actually points to the tarball rather than the repo itself. (Notice that the Ambari and HDP repos are correct, the HDP-UTILS is wrong). Looking back, I see that this error didn't exist in the prior versions (HDP 2.6.2, 2.6.1, 2.6.0).
The latter (ch 3) should be corrected to match the former (from ch 1).