Docs: Fix docker call to run eland

Author: spinscale

docs/en/stack/ml/nlp/ml-nlp-text-emb-vector-search-example.asciidoc

@@ -48,7 +48,7 @@ image:
 
 [source,shell]
 --------------------------------------------------
-docker run -it --rm elastic/eland \
+docker run -it --rm docker.elastic.co/eland/eland \
     eland_import_hub_model \
       --cloud-id $CLOUD_ID \
       -u <username> -p <password> \