Update documentation

Author: RicePatrick

docs/resources/group_project_file_template.md

@@ -4,19 +4,21 @@ page_title: "gitlab_group_project_file_template Resource - terraform-provider-gi
 subcategory: ""
 description: |-
   The gitlab_group_project_file_template resource allows setting a project from which
-  custom file templates will be loaded. The project selected must be a direct child of the group identified.
+  custom file templates will be loaded. In order to use this resource, the project selected must be a direct child of
+  the group selected. After the resource has run, gitlab_project_template.template_project_id is available for use.
   For more information about which file types are available as templates, view
-  GitLab's documentation https://docs.gitlab.com/ee/user/admin_area/settings/instance_template_repository.html#supported-file-types-and-locations
+  GitLab's documentation https://docs.gitlab.com/ee/user/group/custom_project_templates.html
   -> This resource requires a GitLab Enterprise instance with a Premium license.
   Upstream API: GitLab REST API docs https://docs.gitlab.com/ee/api/groups.html#update-group
 ---
 
 # gitlab_group_project_file_template (Resource)
 
 The `gitlab_group_project_file_template` resource allows setting a project from which
-custom file templates will be loaded. The project selected must be a direct child of the group identified.
+custom file templates will be loaded. In order to use this resource, the project selected must be a direct child of
+the group selected. After the resource has run, `gitlab_project_template.template_project_id` is available for use.
 For more information about which file types are available as templates, view 
-[GitLab's documentation](https://docs.gitlab.com/ee/user/admin_area/settings/instance_template_repository.html#supported-file-types-and-locations)
+[GitLab's documentation](https://docs.gitlab.com/ee/user/group/custom_project_templates.html)
 
 -> This resource requires a GitLab Enterprise instance with a Premium license.
 

docs/resources/project.md

@@ -146,7 +146,7 @@ This attribute is only used during resource creation, thus changes are suppresse
 - `squash_option` (String) Squash commits when merge request. Valid values are `never`, `always`, `default_on`, or `default_off`. The default value is `default_off`. [GitLab >= 14.1]
 - `tags` (Set of String) The list of tags for a project; put array of tags, that should be finally assigned to a project. Use topics instead.
 - `template_name` (String) When used without use_custom_template, name of a built-in project template. When used with use_custom_template, name of a custom project template. This option is mutually exclusive with `template_project_id`.
-- `template_project_id` (Number) When used with use_custom_template, project ID of a custom project template. This is preferable to using template_name since template_name may be ambiguous (enterprise edition). This option is mutually exclusive with `template_name`.
+- `template_project_id` (Number) When used with use_custom_template, project ID of a custom project template. This is preferable to using template_name since template_name may be ambiguous (enterprise edition). This option is mutually exclusive with `template_name`. See `gitlab_group_project_file_template` to set a project as a template project. If a project has not been set as a template, using it here will result in an error.
 - `topics` (Set of String) The list of topics for the project.
 - `use_custom_template` (Boolean) Use either custom instance or group (with group_with_project_templates_id) project template (enterprise edition).
 - `visibility_level` (String) Set to `public` to create a public project.