update doc (#261)

Author: ankitdas13

documents/invoice.md

@@ -511,7 +511,7 @@ client.invoice.cancel(invoiceId)
     "id": "cust_E7q0trFqXgExmT",
     "name": "Gaurav Kumar",
     "email": "gaurav.kumar@example.com",
-    "contact": "9972132594",
+    "contact": "+919999999999",
     "gstin": null,
     "billing_address": {
       "id": "addr_E7q0ttqh4SGhAC",
@@ -537,7 +537,7 @@ client.invoice.cancel(invoiceId)
     },
     "customer_name": "Gaurav Kumar",
     "customer_email": "gaurav.kumar@example.com",
-    "customer_contact": "9972132594"
+    "customer_contact": "+919999999999"
   },
   "order_id": "order_E7q0tvRpC0WJwg",
   "line_items": [

documents/order.md

@@ -210,7 +210,7 @@ client.order.payments(orderId)
       "wallet": null,
       "vpa": "success@razorpay",
       "email": "sofiya.shaikh2@razorpay.com",
-      "contact": "+919702219003",
+      "contact": "+919999999999",
       "customer_id": "cust_JR4BVKjKyJ7enk",
       "token_id": "token_Jc81b6OBfodoi6",
       "notes": {