docs: remove dead link in langchain docs (#1198)

The link in question was constantly throwing 404's and I cannot find
anything similar in langchain docs anymore

Author: TC-MO

sources/platform/integrations/ai/langchain.md

@@ -127,6 +127,6 @@ LangChain is a standard interface through which you can interact with a variety
 ## Resources
 
 - https://python.langchain.com/docs/get_started/introduction
+- https://python.langchain.com/docs/integrations/document_loaders/apify_dataset
 - https://python.langchain.com/docs/integrations/providers/apify
-- https://python.langchain.com/docs/integrations/tools/apify
 - https://python.langchain.com/docs/modules/model_io/llms/