docs: Correct example data for get a single job spec

[vermaxik]

Fixed example data for get a single job spec.

There is actual response, the source locale is object, not array.

{
    "id": "5dabeecef237159f189b2af75b8da44c",
    "name": "Translations from 2023-10-18",
    "owner": {
        "id": "b233e...",
        "username": "Maksym...",
        "name": "Maksym..."
    },
    "briefing": "",
    "job_tag_name": "job-12B309E9",
    "due_date": "2023-10-25T11:00:00Z",
    "state": "draft",
    "ticket_url": "",
    "project": {
        "id": "87d8b621...",
        "name": "test",
        "main_format": "",
        "created_at": "2023-07-19T12: 10: 01Z",
        "updated_at": "2023-10-18T13: 51: 50Z"
    },
    "branch": null,
    "created_at": "2023-10-18T13: 51: 50Z",
    "updated_at": "2023-10-18T13: 51: 50Z",
    "source_locale": {
        "id": "0f4bc54...",
        "name": "en",
        "code": "en"
    },
    "locales": [],
    "keys": [],
    "locked": false
}

[theSoenke]

Thanks for fixing it!