cleanup doc string

Author: topper-123

pandas/core/frame.py

@@ -5378,17 +5378,17 @@ def is_unique(
         """
         Return boolean Series denoting columns with unique values.
 
-        Parameter
-        ---------
+        Parameters
+        ----------
         subset : column label or sequence of labels, optional
             Only consider certain columns for finding uniques. by default use columns.
 
         Returns
         -------
         Series
 
-        See Also:
-        ---------
+        See Also
+        --------
         DataFrame.duplicated : Indicate duplicate rows.
         """
         if subset is not None: