Removed versionadded/changed annotations for 5.0.

This also removes remaining versionadded/changed annotations for older
versions.

docs/ref/forms/api.txt

@@ -1192,10 +1192,6 @@ Attributes of ``BoundField``
     When rendering a field with errors, ``aria-invalid="true"`` will be set on
     the field's widget to indicate there is an error to screen reader users.
 
-    .. versionchanged:: 5.0
-
-        The ``aria-invalid="true"`` was added when a field has errors.
-
 .. attribute:: BoundField.field
 
     The form :class:`~django.forms.Field` instance from the form class that
@@ -1289,8 +1285,6 @@ Attributes of ``BoundField``
 
 .. attribute:: BoundField.template_name
 
-    .. versionadded:: 5.0
-
     The name of the template rendered with :meth:`.BoundField.as_field_group`.
 
     A property returning the value of the
@@ -1323,8 +1317,6 @@ Methods of ``BoundField``
 
 .. method:: BoundField.as_field_group()
 
-    .. versionadded:: 5.0
-
     Renders the field using :meth:`.BoundField.render` with default values
     which renders the ``BoundField``, including its label, help text and errors
     using the template's :attr:`~django.forms.Field.template_name` if set
@@ -1372,8 +1364,6 @@ Methods of ``BoundField``
 
 .. method:: BoundField.get_context()
 
-    .. versionadded:: 5.0
-
     Return the template context for rendering the field. The available context
     is ``field`` being the instance of the bound field.
 
@@ -1426,8 +1416,6 @@ Methods of ``BoundField``
 
 .. method:: BoundField.render(template_name=None, context=None, renderer=None)
 
-    .. versionadded:: 5.0
-
     The render method is called by ``as_field_group``. All arguments are 
     optional and default to:
 

docs/ref/forms/fields.txt

@@ -322,10 +322,6 @@ inside ``aria-describedby``:
     >>> print(f["username"])
     <input type="text" name="username" aria-describedby="custom-description id_username_helptext" maxlength="255" id="id_username" required>
 
-.. versionchanged:: 5.0
-
-    ``aria-describedby`` was added to associate ``help_text`` with its input.
-
 .. versionchanged:: 5.1
 
     ``aria-describedby`` support was added for ``<fieldset>``.
@@ -397,8 +393,6 @@ be ignored in favor of the value from the form's initial data.
 
 .. attribute:: Field.template_name
 
-.. versionadded:: 5.0
-
 The ``template_name`` argument allows a custom template to be used when the
 field is rendered with :meth:`~django.forms.BoundField.as_field_group`. By 
 default this value is set to ``"django/forms/field.html"``. Can be changed per
@@ -513,12 +507,6 @@ For each field, we describe the default widget used if you don't specify
         other data types, such as integers or booleans, consider using
         :class:`TypedChoiceField` instead.
 
-    .. versionchanged:: 5.0
-
-        Support for mappings and using
-        :ref:`enumeration types <field-choices-enum-types>` directly in
-        ``choices`` was added.
-
 ``DateField``
 -------------
 
@@ -1145,8 +1133,6 @@ For each field, we describe the default widget used if you don't specify
 
     .. attribute:: assume_scheme
 
-        .. versionadded:: 5.0
-
         The scheme assumed for URLs provided without one. Defaults to
         ``"http"``. For example, if ``assume_scheme`` is ``"https"`` and the
         provided value is ``"example.com"``, the normalized value will be

docs/ref/forms/renderers.txt

@@ -61,8 +61,6 @@ should return a rendered templates (as a string) or raise
 
     .. attribute:: field_template_name
 
-        .. versionadded:: 5.0
-
         The default name of the template used to render a ``BoundField``.
 
         Defaults to ``"django/forms/field.html"``
@@ -173,8 +171,6 @@ forms receive a dictionary with the following values:
 Context available in field templates
 ====================================
 
-.. versionadded:: 5.0
-
 Field templates receive a context from :meth:`.BoundField.get_context`. By
 default, fields receive a dictionary with the following values:
 
@@ -224,8 +220,6 @@ renderer. Then overriding form templates works :doc:`the same as
 Overriding built-in field templates
 ===================================
 
-.. versionadded:: 5.0
-
 :attr:`.Field.template_name`
 
 To override field templates, you must use the :class:`TemplatesSetting`