Fix typo in init object for Apple Pay payment request

Author: tolu-paystack

src/doc/payments/apple-pay/payment-request/index.js

@@ -7,7 +7,7 @@ await paystackPop.paymentRequest({
   currency: 'NGN', // Use NGN for Naira or USD for US Dollars
   ref: 'YOUR_REFERENCE', // Replace with a reference you generated
   container: 'paystack-apple-pay', // ID of div to mount payment button elements
-  loadPaystackCheckButton: 'paystack-other-channels', // ID of button to trigger opening Paystack checkout (optional)
+  loadPaystackCheckoutButton: 'paystack-other-channels', // ID of button to trigger opening Paystack checkout (optional)
   style: { 
     theme: 'dark', // 'light' or 'dark'
     applePay: { 
@@ -31,4 +31,4 @@ await paystackPop.paymentRequest({
   onElementsMount(elements) { // { applePay: true } or null
 
   }
-});
+});