BridgeJS: Include Swift API doc comments in generated d.ts

[kateinoigakukun]

Input

/// API doc comment for eat
/// - Parameters:
/// - food: The food for the sloth to eat.
/// - quantity: The quantity of the food for the sloth to eat.
@JS func eat(_ food: String, quantity: Int) -> Int {}

Expected output (bridge-js.d.ts)

export type Exports = {
 /**
 * API doc comment for eat
 * @param food The food for the sloth to eat.
 * @param quantity: The quantity of the food for the sloth to eat.
 */
 eat(food: string, quantity: number): number;
}