Issue in /main/src/pages/graphql/schema/cart/mutations/set-shipping-address.md

The assign existing customer order talks about a field named `customer_address_uid ` but no such field exists on the ShippingAddressInput

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Open main/src/pages/graphql/schema/cart/mutations/set-shipping-address.md and find the “assign existing customer order” section. Compare its customer_address_uid reference with the documented ShippingAddressInput fields, then update the wording so it names a valid field. Done means the example no longer refers to a nonexistent input field.

Written by the indexing model from the issue text.