First-time tutorials import from k/examples (#4353)

This imports the tutorials from kubernetes/examples repository for the first
time. It adds "DO NOT UPDATE" notices and updates some titles. These tutorials
will be maintained at k/examples repository.

Also fixing a bug in the update script (we were inserting the `<!--` comments
before the metadata section on the top, causing articles to render incorrectly).

Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>

docs/tutorials/stateful-application/mysql-wordpress-persistent-volume.md

@@ -1,10 +1,44 @@
 ---
 title: "Example: WordPress and MySQL with Persistent Volumes"
-assignees:
-- ahmetb
-- jeffmendoza
 ---
 
+<!--
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+DO NOT UPDATE THIS FILE!
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+Submit a patch to https://github.com/kubernetes/examples and
+once it is merged, run ./update-imported-tutorials.sh to
+import it to the website.
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+-->
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 This example describes how to run a persistent installation of
 [WordPress](https://wordpress.org/) and
 [MySQL](https://www.mysql.com/) on Kubernetes. We'll use the
@@ -366,4 +400,4 @@ kubectl delete pv wordpress-pv-1 wordpress-pv-2
 
 <!-- BEGIN MUNGE: GENERATED_ANALYTICS -->
 [![Analytics](https://kubernetes-site.appspot.com/UA-36037335-10/GitHub/examples/mysql-wordpress-pd/README.md?pixel)]()
-<!-- END MUNGE: GENERATED_ANALYTICS -->
+<!-- END MUNGE: GENERATED_ANALYTICS -->