CLN: remove versionadded:: 0.19.0 and earlier (#29127)

Author: simonjayhawkins

pandas/_libs/tslibs/timestamps.pyx

@@ -194,13 +194,10 @@ class Timestamp(_Timestamp):
         valid values are 'D', 'h', 'm', 's', 'ms', 'us', and 'ns'. For
         example, 's' means seconds and 'ms' means milliseconds.
     year, month, day : int
-        .. versionadded:: 0.19.0
     hour, minute, second, microsecond : int, optional, default 0
-        .. versionadded:: 0.19.0
     nanosecond : int, optional, default 0
         .. versionadded:: 0.23.0
     tzinfo : datetime.tzinfo, optional, default None
-        .. versionadded:: 0.19.0
 
     Notes
     -----

pandas/core/frame.py

@@ -6446,8 +6446,6 @@ def diff(self, periods=1, axis=0):
         axis : {0 or 'index', 1 or 'columns'}, default 0
             Take difference over rows (0) or columns (1).
 
-            .. versionadded:: 0.16.1.
-
         Returns
         -------
         DataFrame

pandas/core/tools/datetimes.py

@@ -601,9 +601,6 @@ def to_datetime(
 
         Warning: yearfirst=True is not strict, but will prefer to parse
         with year first (this is a known bug, based on dateutil behavior).
-
-        .. versionadded:: 0.16.1
-
     utc : bool, default None
         Return UTC DatetimeIndex if True (converting any tz-aware
         datetime.datetime objects as well).

pandas/tseries/offsets.py

@@ -980,8 +980,6 @@ def _repr_attrs(self):
 class BusinessHour(BusinessHourMixin, SingleConstructorOffset):
     """
     DateOffset subclass representing possibly n business hours.
-
-    .. versionadded:: 0.16.1
     """
 
     _prefix = "BH"