docs(python): Mention row_by_keys in the to_dict documentation (#…

…19767)

Co-authored-by: gabriel <gabriel.g.robin@airbus.com>

py-polars/polars/dataframe/frame.py

@@ -1627,6 +1627,11 @@ def to_dict(
             True -> Values are Series
             False -> Values are List[Any]
 
+        See Also
+        --------
+        rows_by_key
+        to_dicts
+
         Examples
         --------
         >>> df = pl.DataFrame(
@@ -10383,6 +10388,7 @@ def rows_by_key(
         --------
         rows : Materialize all frame data as a list of rows (potentially expensive).
         iter_rows : Row iterator over frame data (does not materialize all rows).
+        to_dict : Convert DataFrame to a dictionary mapping column name to values.
 
         Examples
         --------