fix: Increase similarity search limit in retriever from 3 to 10

rag.py

@@ -74,7 +74,7 @@ class Rag:
         self.retriever = self.document_vector_store.as_retriever(
             search_type="similarity_score_threshold",
             search_kwargs={
-                "k": 3,
+                "k": 10,
                 "score_threshold": 0.5,
             },
         )