Update duckdb index files

.gitattributes

@@ -89,3 +89,4 @@ code_contests/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 csl/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 drcd/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
 flores/train/index.duckdb filter=lfs diff=lfs merge=lfs -text
+code_docstring_corpus/train/index.duckdb filter=lfs diff=lfs merge=lfs -text

code_docstring_corpus/train/index.duckdb

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:d66d3c32db983d58d32c82bf5d3c458f7570fa5a95df39c4deffb11bce1b5d95
+size 1847296