Update duckdb index files

rworm--langchain-docs/train/index.duckdb

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:052c90aa1c45bd0ee269fdbd660123d3dd8d3f1492dc539c3394914aca3ffc80
-size 8138752
+oid sha256:89208b93a1f53b7276db8cb0feb11786d872e5f7c941dc53f725411d79b3571c
+size 8400896