fix broken grunt docs link

docs/vendors/terraform/terragrunt.md

@@ -19,7 +19,7 @@ During the _Initialization_ phase we're showing you the exact binary that will p
 
 ## Versioning with Terragrunt
 
-When working with Terragrunt, you will still specify the Terraform version to be used to process your job. We don't do it for Terragrunt, which is [way more relaxed in terms](https://terragrunt.gruntwork.io/docs/getting-started/supported-versions/){: rel="nofollow"} of how it interacts with Terraform versions, especially since we're only using a very stable subset of its API.
+When working with Terragrunt, you will still specify the Terraform version to be used to process your job. We don't do it for Terragrunt, which is [way more relaxed in terms](https://terragrunt.gruntwork.io/docs/reference/supported-versions/){: rel="nofollow"} of how it interacts with Terraform versions, especially since we're only using a very stable subset of its API.
 
 On our runner image, we install a version of Terragrunt that will work with the latest version of Terraform that we support. If you need a specific version of Terragrunt, feel free to create a custom runner image and install the Terragrunt version of your choosing.