Generate a doc string comment for the record

[pleshakov]

The F5 telemetry service requires a doc string comment for the record:

Wrong:

@namespace("gateway.nginx.org") protocol NGFProductTelemetry {
	@df_datatype("ngf-product-telemetry") record Data {
		/** The field that identifies what type of data this is. */
		string dataType;
                . . . 

Correct:

@namespace("gateway.nginx.org") protocol NGFProductTelemetry {
	/** Data is the product telemetry data of NGINX Gateway Fabric. */
	@df_datatype("ngf-product-telemetry") record Data {
		/** The field that identifies what type of data this is. */
		string dataType;
                . . . 

[shaun-nx]

@pleshakov I think it might be easier to make this docs string generic.

Some like this:

/** Telemetry data for this product. */

What do you think?

[pleshakov]

@shaun-nx looks reasonable! as long as it is accepted.