[Open Api] Update documentation to create field with an enum

[martmull]

See this help post on discord -> https://discord.com/channels/1130383047699738754/1307654103672819794

{
    "type": "SELECT",
    "name": "country",
    "label": "Country",
    "description": "A field to select a country.",
    "icon": "IconWorld",
    "isNullable": true,
    "objectMetadataId": "{{$randomUUID}}",
    "options": [
        {
            "id": "{{$randomUUID}}",
            "color": "orange",
            "label": "Afghanistan",
            "value": "AFGHANISTAN",
            "position": 0
        },
        {
            "id": "{{$randomUUID}}",
            "color": "pink",
            "label": "Aland Islands",
            "value": "ALAND ISLANDS",
            "position": 1
        }
    ]
}

returns an error "Bad Request Exception"

Fix:

- "value":"ALAND ISLANDS",
+ "value":"ALAND_ISLANDS",

Todo

• Improve error message
• update rest documentation so it adds and details options parameter in metadata create field endpoint