Deleted non-existing method reference. (#54734)

Deleted line

Author: KatTiel

pandas/core/series.py

@@ -5753,7 +5753,6 @@ def to_period(self, freq: str | None = None, copy: bool | None = None) -> Series
         See Also
         --------
         Series.reindex : Conform Series to new index.
-        Series.set_index : Set Series as DataFrame index.
         Index : The base pandas index type.
 
         Notes