Revert "DOC: Fixes after #17482 (#17554)"

This reverts commit 643fc1e.

Author: jorisvandenbossche

doc/source/whatsnew/v0.21.0.txt

@@ -363,7 +363,7 @@ Additionally, DataFrames with datetime columns that were parsed by :func:`read_s
 Consistency of Range Functions
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-In previous versions, there were some inconsistencies between the various range functions: :func:`date_range`, :func:`bdate_range`, :func:`cdate_range`, :func:`period_range`, :func:`timedelta_range`, and :func:`interval_range`. (:issue:`17471`).
+In previous versions, there were some inconsistencies between the various range functions: func:`date_range`, func:`bdate_range`, func:`cdate_range`, func:`period_range`, func:`timedelta_range`, and func:`interval_range`. (:issue:`17471`).
 
 One of the inconsistent behaviors occurred when the ``start``, ``end`` and ``period`` parameters were all specified, potentially leading to ambiguous ranges.  When all three parameters were passed, ``interval_range`` ignored the ``period`` parameter, ``period_range`` ignored the ``end`` parameter, and the other range functions raised.  To promote consistency among the range functions, and avoid potentially ambiguous ranges, ``interval_range`` and ``period_range`` will now raise when all three parameters are passed.
 

pandas/core/api.py

@@ -16,8 +16,7 @@
                                PeriodIndex, NaT)
 from pandas.core.indexes.period import Period, period_range, pnow
 from pandas.core.indexes.timedeltas import Timedelta, timedelta_range
-from pandas.core.indexes.datetimes import (Timestamp, date_range, bdate_range,
-                                           cdate_range)
+from pandas.core.indexes.datetimes import Timestamp, date_range, bdate_range
 from pandas.core.indexes.interval import Interval, interval_range
 
 from pandas.core.series import Series

pandas/core/indexes/datetimes.py

@@ -2094,8 +2094,13 @@ def bdate_range(start=None, end=None, periods=None, freq='B', tz=None,
 def cdate_range(start=None, end=None, periods=None, freq='C', tz=None,
                 normalize=True, name=None, closed=None, **kwargs):
     """
-    Return a fixed frequency DatetimeIndex, with CustomBusinessDay as the
-    default frequency
+    **EXPERIMENTAL** Return a fixed frequency DatetimeIndex, with
+    CustomBusinessDay as the default frequency
+
+    .. warning:: EXPERIMENTAL
+
+        The CustomBusinessDay class is not officially supported and the API is
+        likely to change in future versions. Use this at your own risk.
 
     Parameters
     ----------

pandas/core/indexes/interval.py

@@ -1094,8 +1094,7 @@ def interval_range(start=None, end=None, periods=None, freq=None,
 
     Additionally, datetime-like input is also supported.
 
-    >>> pd.interval_range(start=pd.Timestamp('2017-01-01'),
-                          end=pd.Timestamp('2017-01-04'))
+    >>> pd.interval_range(start='2017-01-01', end='2017-01-04')
     IntervalIndex([(2017-01-01, 2017-01-02], (2017-01-02, 2017-01-03],
                    (2017-01-03, 2017-01-04]]
                   closed='right', dtype='interval[datetime64[ns]]')
@@ -1111,8 +1110,7 @@ def interval_range(start=None, end=None, periods=None, freq=None,
     Similarly, for datetime-like ``start`` and ``end``, the frequency must be
     convertible to a DateOffset.
 
-    >>> pd.interval_range(start=pd.Timestamp('2017-01-01'),
-                          periods=3, freq='MS')
+    >>> pd.interval_range(start='2017-01-01', periods=3, freq='MS')
     IntervalIndex([(2017-01-01, 2017-02-01], (2017-02-01, 2017-03-01],
                    (2017-03-01, 2017-04-01]]
                   closed='right', dtype='interval[datetime64[ns]]')

pandas/tests/api/test_api.py

@@ -63,7 +63,7 @@ class TestPDApi(Base):
     # top-level functions
     funcs = ['bdate_range', 'concat', 'crosstab', 'cut',
              'date_range', 'interval_range', 'eval',
-             'factorize', 'get_dummies', 'cdate_range',
+             'factorize', 'get_dummies',
              'infer_freq', 'isna', 'isnull', 'lreshape',
              'melt', 'notna', 'notnull', 'offsets',
              'merge', 'merge_ordered', 'merge_asof',