Update incorrect link

Signed-off-by: Nguyen Hung Phuong <phuongnh@vn.fujitsu.com>

docs/using_helm.md

@@ -18,8 +18,8 @@ an Apt dpkg, or a Yum RPM file.
 
 A *Repository* is the place where charts can be collected and shared.
 It's like Perl's [CPAN archive](https://www.cpan.org) or the
-[Fedora Package Database](https://admin.fedoraproject.org/pkgdb/), but for
-Kubernetes packages.
+[Fedora Package Database](https://apps.fedoraproject.org/packages/s/pkgdb), but
+for Kubernetes packages.
 
 A *Release* is an instance of a chart running in a Kubernetes cluster.
 One chart can often be installed many times into the same cluster. And