Remove unnecessary markdown formatting in API doc

Remove obsolete link.

Author: meker12

src/pages/optimizer/data-ingestion/using-the-api.md

@@ -80,7 +80,7 @@ For sample requests, see the [tutorial](../ccdm-use-case.md).
 
 <InlineAlert variant="note" slots="text" />
 
-Use the Try It feature in the [API reference](api-reference.md) to test API requests directly from your browser. For details, see [Test API operations](https://developer.adobe.com/commerce/services/reference/rest/).
+Use the Try It feature in the API reference to test API requests directly from your browser. For details, see [Test API operations](https://developer.adobe.com/commerce/services/reference/rest/).
 
 ## Make your first request