* update pod persistent volume example storage class
When binding to a manually created PersistentVolume, the claim must
disable dynamic provisioning by specifying an empty storage class.
Fixes#2803
* use specific storageclass
* revert gibibytes -> gigabytes change
* Update links to outdated user-guide and admin docs
* Add script for updating outdated links.
* Update regex to include init-containers file.
* Pull upstream, rewrite links in and to namespaces walkthrough.