DOC: Fix separator size (pandas-dev#55509). Minor issue.

aureliobarbosa · aureliobarbosa · commit 6de3fceea71c · 2024-03-01T12:07:12.000-03:00
diff --git a/pandas/core/frame.py b/pandas/core/frame.py
@@ -8707,7 +8707,7 @@ def update(
         DataFrame.merge : For column(s)-on-column(s) operations.
 
         Notes
-        --------
+        -----
         1. Duplicate indices on `other` are not supported and raises `ValueError`.
 
         Examples
