Enforce JSDoc block comments

[pquentin]

Right now, the compiler only looks at JSDoc comments for descriptions and annotations. JSDoc ignores comments that don't start with /**, including /*** with three stars.

For example, all those comments are ignored, and the compiler currently uses rest-api-spec to fill them in:

elasticsearch-specification/specification/_global/search_mvt/SearchMvtRequest.ts

Lines 138 to 162 in e3d34e5

	path_parts: {
	/*
	* A list of indices, data streams, or aliases to search.
	* It supports wildcards (`*`).
	* To search all data streams and indices, omit this parameter or use `*` or `_all`.
	* To search a remote cluster, use the `<cluster>:<target>` syntax.
	*/
	index: Indices
	/*
	* A field that contains the geospatial data to return.
	* It must be a `geo_point` or `geo_shape` field.
	* The field must have doc values enabled. It cannot be a nested field.
	*
	* NOTE: Vector tiles do not natively support geometry collections.
	* For `geometrycollection` values in a `geo_shape` field, the API returns a hits layer feature for each element of the collection.
	* This behavior may change in a future release.
	*/
	field: Field
	/* The zoom level of the vector tile to search. It accepts `0` to `29`. */
	zoom: ZoomLevel
	/* The X coordinate for the vector tile to search. */
	x: Coordinate
	/* The Y coordinate for the vector tile to search. */
	y: Coordinate
	}

To fix this, I suggest we only accept two types of comments:

1. JSDoc-style comments starting with /**, and
2. // line comments when we don't want a given comment to be interpreted by the compiler.