docs/Document.md in first_data_gateway-1.2.0 vs docs/Document.md in first_data_gateway-1.3.0

@@ -1,9 +1,19 @@
 # OpenapiClient::Document
 
 ## Properties
+
 Name | Type | Description | Notes
 ------------ | ------------- | ------------- | -------------
 **type** | **String** | Document type. | 
 **number** | **String** | Document number. | 
+
+## Code Sample
+
+```ruby
+require 'OpenapiClient'
+
+instance = OpenapiClient::Document.new(type: NATIONAL_IDENTITY,
+                                 number: 12345666544)
+```