Adapted uses of versionchanged/versionadded to the new form.

Refs #20104.

docs/ref/class-based-views/base.txt

@@ -105,6 +105,7 @@ TemplateView
     in the URL.
 
     .. versionchanged:: 1.5
+
         The context used to be populated with a ``{{ params }}`` dictionary of
         the parameters captured in the URL. Now those parameters are first-level
         context variables.

docs/ref/class-based-views/generic-date-based.txt

@@ -142,7 +142,7 @@ YearArchiveView
 
       .. versionchanged:: 1.5
 
-      Previously, this returned a string.
+         Previously, this returned a string.
 
     * ``next_year``: A :class:`~datetime.date` object
       representing the first day of the next year, according to

docs/ref/class-based-views/mixins-date-based.txt

@@ -330,5 +330,6 @@ BaseDateListView
         :meth:`QuerySet.dates()<django.db.models.query.QuerySet.dates>`.
 
         .. versionchanged:: 1.5
+
             The ``ordering`` parameter was added, and the default order was
             changed to ascending.

docs/ref/class-based-views/mixins-editing.txt

@@ -206,10 +206,10 @@ ProcessFormView
 
         .. versionadded:: 1.6
 
-        ``success_url`` may contain dictionary string formatting, which
-        will be interpolated against the object's field attributes. For
-        example, you could use ``success_url="/parent/%(parent_id)s/"`` to
-        redirect to a URL composed out of the ``parent_id`` field on a model.
+            ``success_url`` may contain dictionary string formatting, which
+            will be interpolated against the object's field attributes. For
+            example, you could use ``success_url="/parent/%(parent_id)s/"`` to
+            redirect to a URL composed out of the ``parent_id`` field on a model.
 
     .. method:: get_success_url()
 

docs/ref/class-based-views/mixins-simple.txt

@@ -67,7 +67,6 @@ TemplateResponseMixin
     .. attribute:: content_type
 
         .. versionadded:: 1.5
-            The ``content_type`` attribute was added.
 
         The content type to use for the response. ``content_type`` is passed
         as a keyword argument to ``response_class``. Default is ``None`` --