resource/gitlab_tag_protection: Improve documentation and reference upstream docs

Author: timofurrer

docs/resources/tag_protection.md

@@ -3,12 +3,15 @@
 page_title: "gitlab_tag_protection Resource - terraform-provider-gitlab"
 subcategory: ""
 description: |-
-  This resource allows you to protect a specific tag or wildcard by an access level so that the user with less access level cannot Create the tags.
+  The gitlab_tag_protection resource allows to manage the lifecycle of a tag protection.
+  Upstream API: GitLab REST API docs https://docs.gitlab.com/ee/api/protected_tags.html
 ---
 
 # gitlab_tag_protection (Resource)
 
-This resource allows you to protect a specific tag or wildcard by an access level so that the user with less access level cannot Create the tags.
+The `gitlab_tag_protection` resource allows to manage the lifecycle of a tag protection.
+
+**Upstream API**: [GitLab REST API docs](https://docs.gitlab.com/ee/api/protected_tags.html)
 
 ## Example Usage
 

internal/provider/resource_gitlab_tag_protection.go

@@ -13,7 +13,9 @@ import (
 
 var _ = registerResource("gitlab_tag_protection", func() *schema.Resource {
 	return &schema.Resource{
-		Description: "This resource allows you to protect a specific tag or wildcard by an access level so that the user with less access level cannot Create the tags.",
+		Description: `The ` + "`" + `gitlab_tag_protection` + "`" + ` resource allows to manage the lifecycle of a tag protection.
+
+**Upstream API**: [GitLab REST API docs](https://docs.gitlab.com/ee/api/protected_tags.html)`,
 
 		CreateContext: resourceGitlabTagProtectionCreate,
 		ReadContext:   resourceGitlabTagProtectionRead,