fix: correct header formatting in functions.rst

kosiew · kosiew · commit d7d67fb8c0f0 · 2025-06-03T09:42:04.000+08:00
diff --git a/docs/source/user-guide/common-operations/functions.rst b/docs/source/user-guide/common-operations/functions.rst
@@ -132,7 +132,7 @@ The function :py:func:`~datafusion.functions.in_list` allows to check a column f
 
 
 Handling Missing Values 
-=====================
+=======================
 
 DataFusion provides methods to handle missing values in DataFrames:
 
