Fixed #25854 -- Removed deprecated usage of template.render() with RequestContext in docs.

docs/topics/http/shortcuts.txt

@@ -72,13 +72,13 @@ MIME type :mimetype:`application/xhtml+xml`::
 This example is equivalent to::
 
     from django.http import HttpResponse
-    from django.template import RequestContext, loader
+    from django.template import loader
 
     def my_view(request):
         # View code here...
         t = loader.get_template('myapp/index.html')
-        c = RequestContext(request, {'foo': 'bar'})
-        return HttpResponse(t.render(c),
+        c = {'foo': 'bar'}
+        return HttpResponse(t.render(c, request),
             content_type="application/xhtml+xml")
 
 ``render_to_response``