add a migration section to Tips & Tricks

R1/source/tips/index.rst

@@ -24,4 +24,4 @@ errors. The :ref:`HowTo <contribdoc>` section will help you get started.
    contribdoc/index
    vcl/index
    varnishlog/index
-
+   migration/index

R1/source/tips/migration/index.rst

+.. _migration:
+
+Migrating Varnish versions
+==========================
+
+XXX: This page is just a skeleton so far, please add tips and details that
+will be useful to users who will be migrating.
+
+* `Migrating from 3.0.x to 4.0.x
+  <https://www.varnish-cache.org/docs/4.1/whats-new/upgrade-4.0.html>`_
+* `Migrating to 4.1.x
+  <https://www.varnish-cache.org/docs/4.1/whats-new/upgrading.html>`_