Rename queryset reference and privacy pages

docs/reference/pages/index.rst

@@ -18,6 +18,6 @@ The presentation of your content, the actual webpages, includes the normal use o
     editing_api
     streamfield
     sites
-    advanced_topics/queryset_methods
-    advanced_topics/private_pages
     model_reference
+    queryset_reference
+    advanced_topics/privacy

docs/reference/pages/queryset_reference.rst

@@ -1,6 +1,6 @@
-=====================
-Page QuerySet Methods
-=====================
+=======================
+Page QuerySet reference
+=======================
 
 All models that inherit from :class:`~wagtail.wagtailcore.models.Page` are given some extra QuerySet methods accessible from their ``.objects`` attribute.