edits per reviewer comments

doc/source/whatsnew/v0.22.0.txt

@@ -45,7 +45,7 @@ Other API Changes
 - :class:`Timestamp` will no longer silently ignore unused or invalid `tz` or `tzinfo` keyword arguments (:issue:`17690`)
 - :class:`Timestamp` will no longer silently ignore invalid `freq` arguments (:issue:`5168`)
 - :class:`CacheableOffset` and :class:`WeekDay` are no longer available in the `tseries.offsets` module (:issue:`17830`)
-- :function:`tseries.frequencies.get_freq_group` and :list:`tseries.frequencies.DAYS` can now be accessed in `_libs.tslibs.resolution` (:issue:`18034`)
+- :function:`tseries.frequencies.get_freq_group` and :list:`tseries.frequencies.DAYS` are removed from the private API (:issue:`18034`)
 .. _whatsnew_0220.deprecations:
 
 Deprecations

pandas/tests/scalar/test_period.py

@@ -13,8 +13,7 @@
 from pandas._libs import tslib, period as libperiod
 from pandas._libs.tslibs.parsing import DateParseError
 from pandas import Period, Timestamp, offsets
-from pandas._libs.tslibs.resolution import DAYS
-from pandas.tseries.frequencies import MONTHS
+from pandas._libs.tslibs.resolution import DAYS, _MONTHS as MONTHS
 
 
 class TestPeriodProperties(object):