perf: forgot to enable concurrency for answering documents

Signed-off-by: thiswillbeyourgithub <26625900+thiswillbeyourgithub@users.noreply.github.com>

Author: thiswillbeyourgithub

wdoc/wdoc.py

@@ -1022,7 +1022,9 @@ def create_autoincrease_top_k_chain(inputs):
             ]
         ) | {
             "intermediate_answers": itemgetter("inputs")
-            | RunnableEach(bound=answer_each_doc_chain),
+            | RunnableEach(bound=answer_each_doc_chain.with_config(multi)).with_config(
+                multi
+            ),
             "question_to_answer": itemgetter("question_to_answer"),
             "filtered_docs": itemgetter("filtered_docs"),
             "unfiltered_docs": itemgetter("unfiltered_docs"),