Docs: update terraform documentation to assign basic_roles (#102087)

* Docs: update terraform documentation to assign basic_roles

* fmt

docs/sources/administration/roles-and-permissions/access-control/rbac-terraform-provisioning/index.md

@@ -93,6 +93,75 @@ provider "grafana" {
 }
 ```
 
+## Provision basic roles
+
+The following example shows how to assign basic roles to users, teams, and service accounts. Basic roles are predefined in Grafana and provide a set of permissions for common use cases.
+
+| Basic role      | UID                   |
+| --------------- | --------------------- |
+| `None`          | `basic_none`          |
+| `Viewer`        | `basic_viewer`        |
+| `Editor`        | `basic_editor`        |
+| `Admin`         | `basic_admin`         |
+| `Grafana Admin` | `basic_grafana_admin` |
+
+You can use any of the basic role UIDs from the table above in your role assignments. For example, to assign the "None" role, use `basic_none` as the `role_uid`.
+
+```terraform
+resource "grafana_team" "viewer_team" {
+  name = "terraform_viewer_team"
+}
+
+resource "grafana_user" "editor_user" {
+  email    = "terraform_editor@example.com"
+  login    = "terraform_editor_user"
+  password = <TEST_PASSWORD>
+}
+
+resource "grafana_service_account" "admin_sa" {
+  name = "terraform_admin_sa"
+}
+
+# Assign Viewer role to a team
+resource "grafana_role_assignment" "viewer_role_assignment" {
+  role_uid = "basic_viewer"
+  teams    = [grafana_team.viewer_team.id]
+}
+
+# Assign Editor role to a user
+resource "grafana_role_assignment" "editor_role_assignment" {
+  role_uid = "basic_editor"
+  users    = [grafana_user.editor_user.id]
+}
+
+# Assign Admin role to a service account
+resource "grafana_role_assignment" "admin_role_assignment" {
+  role_uid = "basic_admin"
+  service_accounts = [grafana_service_account.admin_sa.id]
+}
+```
+
+### Provision basic role to multiple users
+
+```terraform
+resource "grafana_user" "editor_user_2" {
+  email    = "terraform_editor_2@example.com"
+  login    = "terraform_editor_2_user"
+  password = <TEST_PASSWORD>
+}
+resource "grafana_user" "editor_user_3" {
+  email    = "terraform_editor_3@example.com"
+  login    = "terraform_editor_3_user"
+  password = <TEST_PASSWORD>
+}
+
+# Assign Editor role to multiply users
+resource "grafana_role_assignment" "editor_role_assignment" {
+  role_uid = "basic_editor"
+  users    = [grafana_user.editor_user_2.id, grafana_user.editor_user_3.id]
+}
+```
+
 ## Provision custom roles
 
 The following example shows how to provision a custom role with some permissions.