DOC: move release note for #36175
xref https://github.com/pandas-dev/pandas/pull/36175#issuecomment-691994652
test failures. restarting ci

```
=========================== short test summary info ===========================
FAILED pandas/tests/plotting/test_groupby.py::TestDataFrameGroupByPlots::test_series_groupby_plotting_nominally_works
ERROR pandas/tests/io/json/test_pandas.py::TestPandasContainer::test_to_s3 - ...
= 1 failed, 75229 passed, 1809 skipped, 1180 xfailed, 6 xpassed, 67 warnings, 1 error in 1769.60s (0:29:29) =
```