Update README.md

[ivarmu]

The field user in the gateway_role_user_assignements role is not handling well the id of the user, so, only the user's username is working correctly

Working OK:

ok: [localhost] => (item=Create/Update Role Organization Member | Wait for finish the Roles creation) => {
    "__gateway_role_user_assignments_job_async_results_item": {
        "__gateway_role_user_assignments_item": {
            "object_id": "2",
            "role_definition": "Organization Member",
            "user": "test_user_1"
        },
        "ansible_job_id": "j820885315526.537903",
        "ansible_loop_var": "__gateway_role_user_assignments_item",
        "changed": false,
        "failed": 0,
        "finished": 0,
        "results_file": "/home/ivan/.ansible_async/j820885315526.537903",
        "started": 1
    },
    "ansible_job_id": "j820885315526.537903",
    "ansible_loop_var": "__gateway_role_user_assignments_job_async_results_item",
    "attempts": 1,
    "changed": false,
    "finished": 1,
    "invocation": {
        "module_args": {
            "gateway_hostname": "aap25.iam.lab",
            "gateway_password": "VALUE_SPECIFIED_IN_NO_LOG_PARAMETER",
            "gateway_request_timeout": null,
            "gateway_token": "VALUE_SPECIFIED_IN_NO_LOG_PARAMETER",
            "gateway_username": "VALUE_SPECIFIED_IN_NO_LOG_PARAMETER",
            "gateway_validate_certs": false,
            "object_ansible_id": null,
            "object_id": 2,
            "role_definition": "Organization Member",
            "state": "present",
            "user": "test_user_1",
            "user_ansible_id": null
        }
    },
    "results_file": "/home/ivan/.ansible_async/j820885315526.537903",
    "started": 1,
    "stderr": "",
    "stderr_lines": [],
    "stdout": "",
    "stdout_lines": []
}

Failing:

failed: [localhost] (item=Create/Update Role 2 | Wait for finish the Roles creation) => {
    "__gateway_role_user_assignments_job_async_results_item": {
        "__gateway_role_user_assignments_item": {
            "object_id": "1",
            "role_definition": "2",
            "user": "3"
        },
        "ansible_job_id": "j374059080902.537920",
        "ansible_loop_var": "__gateway_role_user_assignments_item",
        "changed": false,
        "failed": 0,
        "finished": 0,
        "results_file": "/home/ivan/.ansible_async/j374059080902.537920",
        "started": 1
    },
    "ansible_job_id": "j374059080902.537920",
    "ansible_loop_var": "__gateway_role_user_assignments_job_async_results_item",
    "attempts": 1,
    "changed": false,
    "finished": 1,
    "invocation": {
        "module_args": {
            "gateway_hostname": "aap25.iam.lab",
            "gateway_password": "VALUE_SPECIFIED_IN_NO_LOG_PARAMETER",
            "gateway_request_timeout": null,
            "gateway_token": "VALUE_SPECIFIED_IN_NO_LOG_PARAMETER",
            "gateway_username": "VALUE_SPECIFIED_IN_NO_LOG_PARAMETER",
            "gateway_validate_certs": false,
            "object_ansible_id": null,
            "object_id": 1,
            "role_definition": "2",
            "state": "present",
            "user": "3",
            "user_ansible_id": null
        }
    },
    "msg": "c{'user': 'Provide exactly one of user or user_ansible_id', 'user_ansible_id': 'Provide exactly one of user or user_ansible_id'}",
    "results_file": "/home/ivan/.ansible_async/j374059080902.537920",
    "started": 1,
    "stderr": "",
    "stderr_lines": [],
    "stdout": "",
    "stdout_lines": []
}

What does this PR do?

Fixes the documentation to reflect only the username option, and not the id.

How should this be tested?

I'm testing this manually as part of redhat-cop/aap_configuration_extended#44

Is there a relevant Issue open for this?

Other Relevant info, PRs, etc

N/A

[djdanielsson]

it's probably better this way anyways, I don't believe in hard coding ID's