[DOCS]Removes link pointing to EIS reference docs. (#2708)

(cherry picked from commit 6042bcd)

Author: szabosteve

docs/reference.asciidoc

@@ -8283,7 +8283,6 @@ Create an Elastic Inference Service (EIS) inference endpoint.
 
 Create an inference endpoint to perform an inference task through the Elastic Inference Service (EIS).
 
-{ref}/infer-service-elastic.html[Endpoint documentation]
 [source,ts]
 ----
 client.inference.putEis({ task_type, eis_inference_id, service, service_settings })