Update docs

Author: giacomosirri

docs/resources/iam_user.md

@@ -10,14 +10,27 @@ For more information, see the [API documentation](https://www.scaleway.com/en/de
 
 ## Example Usage
 
-### Basic
+### Guest user
 
 ```terraform
-resource "scaleway_iam_user" "basic" {
+resource "scaleway_iam_user" "guest" {
   email = "[email protected]"
+  tags  = ["test-tag"]
 }
 ```
 
+### Member user
+
+```terraform
+resource "scaleway_iam_user" "member" {
+  email    = "[email protected]"
+  tags     = ["test-tag"]
+  username = "test"
+}
+```
+
+When username is set, the user is created as a [Member](https://www.scaleway.com/en/docs/iam/concepts/#member). Otherwise, it is created as a [Guest](https://www.scaleway.com/en/docs/iam/concepts/#guest).
+
 ### Multiple users
 
 ```terraform
@@ -28,7 +41,7 @@ locals {
   ])
 }
 
-resource scaleway_iam_user user {
+resource "scaleway_iam_user" "user" {
   for_each = local.users
   email = each.key
 }
@@ -42,21 +55,36 @@ resource scaleway_iam_user user {
 
 - `organization_id` - (Defaults to [provider](../index.md#organization_d) `organization_id`) The ID of the organization the user is associated with.
 
+- `username` - (Optional) The username of the IAM user. When it is set, the user is created as a Member. When it is not set, the user is created as a Guest and the username is set as equal to the email.
+
+- `password` - The password for first access. It gets ignored if the user is a Guest.
+
+- `send_password_email` - Whether or not to send an email containing the member's password.
+
+- `send_welcome_email` - Whether or not to send a welcome email that includes onboarding information.
+
+- `first_name` - The user's first name.
+
+- `first_name` - The user's last name.
+
+- `phone_number` - The user's phone number.
+
+- `locale` - The user's locale (e.g. en_US).
+
 ## Attributes Reference
 
 In addition to all arguments above, the following attributes are exported:
 
 - `id` - The ID of the user (UUID format).
-- `email` - The email of the user
 - `created_at` - The date and time of the creation of the IAM user.
 - `updated_at` - The date and time of the last update of the IAM user.
 - `deletable` - Whether the IAM user is deletable.
-- `organization_id` - The ID of the organization the user.
 - `last_login_at` - The date of the last login.
 - `type` - The type of user. Check the possible values in the [API doc](https://www.scaleway.com/en/developers/api/iam/#path-users-get-a-given-user).
 - `status` - The status of user invitation. Check the possible values in the [API doc](https://www.scaleway.com/en/developers/api/iam/#path-users-get-a-given-user).
 - `mfa` - Whether the MFA is enabled.
 - `account_root_user_id` - The ID of the account root user associated with the user.
+- `locked` - Whether the user is locked.
 
 ## Import