fix series fillna doctest

tswast · tswast · commit 13807a12e69b · 2025-10-16T17:00:06.000Z
diff --git a/.gitignore b/.gitignore
@@ -62,3 +62,4 @@ system_tests/local_test_setup
 # Make sure a generated file isn't accidentally committed.
 pylintrc
 pylintrc.test
+dummy.pkl
diff --git a/third_party/bigframes_vendored/pandas/core/series.py b/third_party/bigframes_vendored/pandas/core/series.py
@@ -2443,7 +2443,7 @@ def fillna(
 
             >>> s_fill = bpd.Series([11, 22, 33])
             >>> s.fillna(s_fill)
-            0    11.0
+            0     NaN
             1     2.0
             2    33.0
             3    -1.0
