fix a link to cart-provider page (#327)

Author: milindgoel15

docs/docs/usage/actions/redirectToCheckout().mdx

@@ -9,7 +9,7 @@ To send the buyer to Stripe's Checkout experience, use `redirectToCheckout`
 (the preferred way) or refer to products in your Stripe dashboard to fulfill purchases.
 
 With use-shopping-cart's `redirectToCheckout`, you don't need to pass anything more than the sessionId you get
-from Stripe because all of the config is handled in the [CartProvider](docs/usage/cart-provider) props.
+from Stripe because all of the config is handled in the [CartProvider](docs/usage/components/cart-provider) props.
 
 This is how you'd use `redirectToCheckout()` with a serverless function: