Make model_details.documentation field more human-readable/writable

[jeongukjae]

Hi, all.

model-card-toolkit/model_card_toolkit/schema/v0.0.2/model_card.schema.json

Lines 24 to 27 in 74d7e6d

	"documentation": {
	"description": "A thorough description of the model and its usage.",
	"type": "string"
	},

The model_details.documentation's description says this field is for the description of the model and its usage, but I think it is very hard to fill/read it.

For example, if I want to write the code sample for the model, it is extremely hard to fill it. The <code> or <pre> tags will be escaped (because the autoescape option is enabled), and no line break is possible since <br> tag also will be escaped. Even though it becomes possible to inject tags for the code example, it is very hard to write multiline strings (guessing 10-20 lines of codes and comments) in JSON.

It would be better if the way to fill it is improved or if there's a guide to fill it more simply. But for me, I don't have great ideas to improve this feature. So I want to discuss this.