doc fixes

doc/source/whatsnew/v0.20.0.txt

@@ -472,14 +472,16 @@ New Behavior:
    s.map(lambda x: x.hour)
 
 
+.. _whatsnew_0200.api_breaking.index_dt_field:
+
 Accessing datetime fields of Index now return Index
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 The several datetime-related attributes (see :ref:`here <timeseries.components>`
-for an overview) of DatetimeIndex, PeriodIndex and TimedeltaIndex previously
+for an overview) of ``DatetimeIndex``, ``PeriodIndex`` and ``TimedeltaIndex`` previously
 returned numpy arrays, now they will return a new Index object (:issue:`15022`).
-Only in case of a boolean field, still a boolean array is returned to support
-boolean indexing.
+Only in the case of a boolean field, a the return value is still a boolean array
+instead of an Index (to support boolean indexing).
 
 Previous behaviour:
 

pandas/tests/indexes/datetimes/test_misc.py

@@ -260,7 +260,7 @@ def test_datetimeindex_accessors(self):
 
             # non boolean accessors -> return Index
             for accessor in ['year', 'month', 'day', 'hour', 'minute',
-                             'second',  'microsecond', 'nanosecond',
+                             'second', 'microsecond', 'nanosecond',
                              'dayofweek', 'dayofyear', 'weekofyear',
                              'quarter', 'weekday_name']:
                 res = getattr(dti, accessor)