website: Add links to registry doc preview tool (#25619)

website/docs/registry/providers/docs.html.md

@@ -10,9 +10,9 @@ description: |-
 
 The [Terraform Registry][terraform-registry] displays documentation for the providers it hosts. This page describes the expected format for provider documentation.
 
-## Publishing
+-> In order to test how documents will render in the Terraform Registry, you can use the [Terraform Registry Doc Preview Tool](https://registry.terraform.io/tools/doc-preview).
 
--> **Note:** Publishing is currently in a closed beta. Although we do not expect this document to change significantly before opening provider publishing to the community, this reference currently only applies to providers already appearing on the [Terraform Registry providers list][terraform-registry-providers].
+## Publishing
 
 The Terraform Registry publishes providers from their Git repositories, creating a version for each Git tag that matches the [Semver](https://semver.org/) versioning format. Provider documentation is published automatically as part of the provider release process.
 

website/docs/registry/providers/publishing.html.md

@@ -40,6 +40,8 @@ All Terraform Verified providers must contain one of the following open source l
 
 Your provider should contain an overview document (index.md), as well as a doc for each resource and data-source. See [Documenting Providers](./docs.html) for details about how to ensure your provider documentation renders properly on the Terraform Registry.
 
+-> In order to test how documents will render in the Terraform Registry, you can use the [Terraform Registry Doc Preview Tool](https://registry.terraform.io/tools/doc-preview).
+
 ### Creating a GitHub Release
 
 Publishing a provider requires at least one version be available on GitHub Releases. The tag must be a valid [Semantic Version](https://semver.org/) preceded with a `v` (for example, `v1.2.3`).