Resolve "Docs feedback: Terraform module registry additional info link"

doc/user/packages/terraform_module_registry/index.md

@@ -36,7 +36,7 @@ PUT /projects/:id/packages/terraform/modules/:module-name/:module-system/:module
 | -------------------| --------------- | ---------| -------------------------------------------------------------------------------------------------------------------------------- |
 | `id`               | integer/string  | yes      | The ID or [URL-encoded path of the project](../../../api/index.md#namespaced-path-encoding).                                    |
 | `module-name`      | string          | yes      | The package name. It can contain only lowercase letters (`a-z`), uppercase letter (`A-Z`), numbers (`0-9`), or hyphens (`-`) and cannot exceed 64 characters.
-| `module-system`    | string          | yes      | The package system. It can contain only lowercase letters (`a-z`) and numbers (`0-9`), and cannot exceed 64 characters.
+| `module-system`    | string          | yes      | The package system. It can contain only lowercase letters (`a-z`) and numbers (`0-9`), and cannot exceed 64 characters. More information can be found in the [Terraform Module Registry Protocol documentation](https://www.terraform.io/internals/module-registry-protocol).
 | `module-version`   | string          | yes      | The package version. It must be valid according to the [Semantic Versioning Specification](https://semver.org/).
 
 Provide the file content in the request body.