[3.1.x] Fixed #31877 -- Reverted "Fixed #19878 -- Deprecated TemplateView passing URL kwargs into context."

This reverts commit 4ed534758c.

Backport of bb8f66934d from master

docs/internals/deprecation.txt

@@ -79,9 +79,6 @@ details on these changes.
 
 * The ``list`` message for ``ModelMultipleChoiceField`` will be removed.
 
-* ``django.views.generic.TemplateView`` will no longer pass URL kwargs directly
-  to the ``context``.
-
 * Support for passing raw column aliases to ``QuerySet.order_by()`` will be
   removed.
 

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

@@ -117,7 +117,8 @@ MRO is an acronym for Method Resolution Order.
 
 .. class:: django.views.generic.base.TemplateView
 
-    Renders a given template.
+    Renders a given template, with the context containing parameters captured
+    in the URL.
 
     **Ancestors (MRO)**
 
@@ -161,17 +162,12 @@ MRO is an acronym for Method Resolution Order.
 
     **Context**
 
-    * Populated (through :class:`~django.views.generic.base.ContextMixin`).
+    * Populated (through :class:`~django.views.generic.base.ContextMixin`) with
+      the keyword arguments captured from the URL pattern that served the view.
     * You can also add context using the
       :attr:`~django.views.generic.base.ContextMixin.extra_context` keyword
       argument for :meth:`~django.views.generic.base.View.as_view`.
 
-    .. deprecated:: 3.1
-
-        Starting in Django 4.0, the keyword arguments captured from the URL
-        pattern won't be passed to the context. Reference them with
-        ``view.kwargs`` instead.
-
 ``RedirectView``
 ================
 

docs/releases/3.1.1.txt

@@ -31,3 +31,7 @@ Bugfixes
 
 * Fixed a regression in Django 3.1 that caused a crash when decoding an invalid
   session data (:ticket:`31895`).
+
+* Reverted a deprecation in Django 3.1 that caused a crash when passing
+  deprecated keyword arguments to a queryset in
+  ``TemplateView.get_context_data()`` (:ticket:`31877`).

docs/releases/3.1.txt

@@ -798,10 +798,6 @@ Miscellaneous
 * The ``list`` message for :class:`~django.forms.ModelMultipleChoiceField` is
   deprecated in favor of ``invalid_list``.
 
-* The passing of URL kwargs directly to the context by
-  :class:`~django.views.generic.base.TemplateView` is deprecated. Reference
-  them in the template with ``view.kwargs`` instead.
-
 * Passing raw column aliases to :meth:`.QuerySet.order_by` is deprecated. The
   same result can be achieved by passing aliases in a
   :class:`~django.db.models.expressions.RawSQL` instead beforehand.