Wiki createDiscount function missing isLimitedToProducts option

[felixranesberger]

Hi! I just created a discount using the wiki page: https://github.com/lmsqueezy/lemonsqueezy.js/wiki/Discounts#usage

I found that the discount was not limited to certain products, as the variantIds configuration option would suggest.
When adding isLimitedToProducts: true it works fine.
It should probably be also listed in the example, since most users would expect the coupon to be limited, when variantIds are provided.

Current

const { statusCode, error, data } = await createDiscount({
	name: 'TestDiscount',
	amount: 50,
	amountType: 'percent',
	storeId: 123456,
	variantIds: [345678, 456789],
});

Proposed

const { statusCode, error, data } = await createDiscount({
	name: 'TestDiscount',
	amount: 50,
	amountType: 'percent',
	storeId: 123456,
	variantIds: [345678, 456789],
	isLimitedToProducts: true,
});