DOC: add whatnsew

Author: arw2019

doc/source/whatsnew/v1.2.0.rst

@@ -433,6 +433,7 @@ I/O
 - Bug in :meth:`to_json` with ``lines=True`` and ``orient='records'`` the last line of the record is not appended with 'new line character' (:issue:`36888`)
 - Bug in :meth:`read_parquet` with fixed offset timezones. String representation of timezones was not recognized (:issue:`35997`, :issue:`36004`)
 - Bug in output rendering of complex numbers showing too many trailing zeros (:issue:`36799`)
+- Bug in :meth:`DataFrame.to_parquet` now returns bytes when no ``path`` argument is passed (:issue:`37105`)
 
 Plotting
 ^^^^^^^^