Updates a Model.
apigatewayv2_update_model(ApiId, ContentType, Description, ModelId,
Name, Schema)
[required] The API identifier.
The content-type for the model, for example, \"application/json\".
The description of the model.
[required] The model ID.
The name of the model.
The schema for the model. For application/json models, this should be JSON schema draft 4 model.
svc$update_model( ApiId = "string", ContentType = "string", Description = "string", ModelId = "string", Name = "string", Schema = "string" )