updated link for API Docs

Author: jon-batscha

README.md

@@ -2,7 +2,7 @@
 
 This repo contains versioned copies of our [OpenAPI spec](https://www.openapis.org/).
 
-This is the same spec we use to generate our [API Docs](https://developers.klaviyo.com/en), as well as our latest [SDKs](https://developers.klaviyo.com/en/docs/sdk_overview).
+This is the same spec we use to generate our [API Docs](https://developers.klaviyo.com/en/reference/get_catalog_items), as well as our latest [SDKs](https://developers.klaviyo.com/en/docs/sdk_overview).
 
 You can find the general spec (and soon, SDK/language-specific specs) in the `openapi` folder