docs(README): generalize third-party license link

README.md

@@ -60,14 +60,16 @@ This project has adopted the [Microsoft Open Source Code of Conduct](https://ope
 
 This software is covered under the MIT license. You can read the license [here][license].
 
-This software contains code from Heroku Buildpacks, which are also covered by the MIT license. You can read their license [here][Heroku License].
+This software contains code from Heroku Buildpacks, which are also covered by the MIT license.
 
 This software contains code from [Helm][], which is covered by the Apache v2.0 license.
 
+You can read third-party software licenses [here][Third-Party Licenses].
+
 
 [Getting Started]: docs/getting-started.md
 [hacking]: docs/contributing/hacking.md
 [Helm]: https://github.com/kubernetes/helm
 [Kubernetes]: https://kubernetes.io/
 [license]: LICENSE
-[Heroku License]: NOTICE
+[Third-Party Licenses]: NOTICE