magento/devdocs#: GraphQl Checkout Tutorial

1. Made corrections for setShippingMethodsOnCart regarding magento/graphql-ce#609

Author: atwixfirster

guides/v2.3/graphql/tutorials/checkout/checkout-shipping-method.md

@@ -16,83 +16,9 @@ contributor_link: https://www.atwix.com/
 
 `setShippingMethodsOnCart` mutation query is using to define a shipping method for your order and requires the next input parameters:
  - `cart_id`
- - `cart_address_id`
  - `carrier_code`
  - `method_code`
 
-### Get `cart_address_id` and available shipping methods
-
-Use `cart` query to retrieve `cart_address_id` and available shipping methods for your quote.
-
-**Request**
-```text
-query {
-  cart (cart_id: "{{ CART_ID }}") {
-    shipping_addresses {
-      address_id  
-      available_shipping_methods {
-          amount
-          base_amount
-          carrier_code
-          carrier_title
-          error_message
-          method_code
-          method_title
-          price_excl_tax
-          price_incl_tax
-      }
-    }
-  }
-}
-```
-
-where
-`{{ CART_ID }}` - shopping cart unique ID from [Step 2. Create empty cart]({{ page.baseurl }}/graphql/tutorials/checkout/checkout-add-product-to-cart.html).
-
-**Response**
-
-```json
-{
-  "data": {
-    "cart": {
-      "shipping_addresses": [
-        {
-          "address_id": 937,
-          "available_shipping_methods": [
-            {
-              "amount": 5,
-              "base_amount": 5,
-              "carrier_code": "flatrate",
-              "carrier_title": "Flat Rate",
-              "error_message": "",
-              "method_code": "flatrate",
-              "method_title": "Fixed",
-              "price_excl_tax": 5,
-              "price_incl_tax": 5
-            },
-            {
-              "amount": 9.9,
-              "base_amount": 9.9,
-              "carrier_code": "ups",
-              "carrier_title": "United Parcel Service",
-              "error_message": "",
-              "method_code": "GND",
-              "method_title": "Ground",
-              "price_excl_tax": 9.9,
-              "price_incl_tax": 9.9
-            }
-          ]
-        }
-      ]
-    }
-  }
-}
-```
-
-In the next tutorial steps value of `address_id` field - `937` will be mentioned as `{{ CART_SHIPPING_ADDRESS_ID }}`.
-
-### Specify shipping method for your order
-
 **Request**
 
 The following mutation query assigns UPS "Ground" method.
@@ -103,7 +29,6 @@ mutation {
     cart_id: "{{ CART_ID }}"
     shipping_methods: [
       {
-        cart_address_id: {{ CART_SHIPPING_ADDRESS_ID }}
         carrier_code: "ups"
         method_code: "GND"
       }
@@ -124,7 +49,6 @@ mutation {
 
 where
 `{{ CART_ID }}` - shopping cart unique ID from [Step 2. Create empty cart]({{ page.baseurl }}/graphql/tutorials/checkout/checkout-add-product-to-cart.html).
-`{{ CART_SHIPPING_ADDRESS_ID }}` - shipping address ID from the query above.
 
 **Response**