Update apify-api/openapi/openapi.yaml

Co-authored-by: Jan Čurn <[email protected]>

Author: TC-MO

apify-api/openapi/openapi.yaml

@@ -12,7 +12,7 @@ info:
     around [RESTful](https://en.wikipedia.org/wiki/Representational_state_transfer)
     HTTP endpoints. 
     
-    You can check the complete OpenAPI schema in the following formats:
+You can download the complete OpenAPI schema of Apify API in the [YAML](http://docs.apify.com/api/openapi.yaml) or [JSON](http://docs.apify.com/api/openapi.json) formats. The source code is available on [GitHub](https://github.com/apify/apify-docs/tree/master/apify-api/openapi).
 
     - [OpenAPI YAML](http://docs.apify.com/api/openapi.yaml)
     - [OpenAPI JSON](http://docs.apify.com/api/openapi.json)