Fix broken link (#1014)

Author: JoelNiklaus

docs/source/use-inference-providers-as-backend.mdx

@@ -66,4 +66,4 @@ model_parameters:
   org_to_bill: "my-organization"
 ```
 
-For more detailed error handling and provider-specific information, refer to the [Hugging Face Inference Providers documentation](https://huggingface.co/docs/inference-endpoints/guides/inference_providers).
+For more detailed error handling and provider-specific information, refer to the [Hugging Face Inference Providers documentation](https://huggingface.co/docs/inference-providers/en/index).