resource/gitlab_user_sshkey: Improve documentation and reference upstream docs

Author: timofurrer

docs/resources/user_sshkey.md

@@ -3,13 +3,13 @@
 page_title: "gitlab_user_sshkey Resource - terraform-provider-gitlab"
 subcategory: ""
 description: |-
-  This resource allows to manage GitLab user SSH keys.
+  The gitlab_user_sshkey resource allows to manage the lifecycle of an SSH key assigned to a user.
   Upstream API: GitLab API docs https://docs.gitlab.com/ee/api/users.html#single-ssh-key
 ---
 
 # gitlab_user_sshkey (Resource)
 
-This resource allows to manage GitLab user SSH keys.
+The `gitlab_user_sshkey` resource allows to manage the lifecycle of an SSH key assigned to a user.
 
 **Upstream API**: [GitLab API docs](https://docs.gitlab.com/ee/api/users.html#single-ssh-key)
 

internal/provider/resource_gitlab_user_sshkey.go

@@ -16,7 +16,7 @@ import (
 
 var _ = registerResource("gitlab_user_sshkey", func() *schema.Resource {
 	return &schema.Resource{
-		Description: `This resource allows to manage GitLab user SSH keys.
+		Description: `The ` + "`" + `gitlab_user_sshkey` + "`" + ` resource allows to manage the lifecycle of an SSH key assigned to a user.
 
 **Upstream API**: [GitLab API docs](https://docs.gitlab.com/ee/api/users.html#single-ssh-key)`,