Removed versionadded/changed annotations for 2.0.

docs/ref/models/database-functions.txt

@@ -178,10 +178,6 @@ Django usually uses the databases' extract function, so you may use any
 ``lookup_name`` that your database supports. A ``tzinfo`` subclass, usually
 provided by ``pytz``, can be passed to extract a value in a specific timezone.
 
-.. versionchanged:: 2.0
-
-    Support for ``DurationField`` was added.
-
 Given the datetime ``2015-06-15 23:30:01.000321+00:00``, the built-in
 ``lookup_name``\s return:
 
@@ -274,8 +270,6 @@ Usage example::
 
 .. class:: ExtractQuarter(expression, tzinfo=None, **extra)
 
-    .. versionadded:: 2.0
-
     .. attribute:: lookup_name = 'quarter'
 
 These are logically equivalent to ``Extract('date_field', lookup_name)``. Each
@@ -517,8 +511,6 @@ Usage example::
 
 .. class:: TruncQuarter(expression, output_field=None, tzinfo=None, **extra)
 
-    .. versionadded:: 2.0
-
     .. attribute:: kind = 'quarter'
 
 These are logically equivalent to ``Trunc('date_field', kind)``. They truncate
@@ -938,8 +930,6 @@ spaces.
 
 .. class:: StrIndex(string, substring, **extra)
 
-.. versionadded:: 2.0
-
 Returns a positive integer corresponding to the 1-indexed position of the first
 occurrence of ``substring`` inside ``string``, or 0 if ``substring`` is not
 found.
@@ -1028,8 +1018,6 @@ Usage example::
 Window functions
 ================
 
-.. versionadded:: 2.0
-
 There are a number of functions to use in a
 :class:`~django.db.models.expressions.Window` expression for computing the rank
 of elements or the :class:`Ntile` of some rows.