[DOCS] update docs snippets for suggestions ingestion

[burtenshaw]

This PR closes #160

By updating the snippet to conform with functionality:

dataset.records.add(
    [
        {
            "text": "Hello World, how are you?",
            "label": "negative",
            "label.suggestion.response": "negative",
            "label.suggestion.score": 0.9,
        },
    ]
)

[burtenshaw]

@frascuchon This assumes that we do not want to change the functionality?

[frascuchon]

@frascuchon This assumes that we do not want to change the functionality?

Not for now, but I think it makes sense to support in the future label.score or label.agent to map automatically the score or agent for a suggestion. What do you think?

[frascuchon]

Sorry. I saw this and not sure if suggestion.value instead of suggestion.response. I think we're already using .value on exports?

[burtenshaw]

You're right. I missed that there was a response. I've changed the example to make it clearer how it works.