Update rag_langgraph.py

rag_langgraph.py

@@ -117,7 +117,7 @@ def create_graph(topic, word_count):
 
 def run_multi_agent(topic, word_count):
     graph = create_graph(topic, word_count)
-    result = graph.invoke({
+    return graph.invoke({
         "messages": [
             HumanMessage(content="Evolution of Retrieval-Augmented Generation from Naive RAG to Agentic RAG")
         ]