Add example of PVC annotations for san-economy import

[torirevilla]

Page URL

https://docs.netapp.com/us-en/trident/trident-use/vol-import.html

Page title

Import volumes

Summary

Please add an example for san-economy import using the PVC annotation under the "ONTAP SAN-economy examples" section.
The PVC annotations are the same as what is written under "ONTAP NAS examples using PVC annotations".
Here is the section that would be different specifically for san economy:

  annotations:
    trident.netapp.io/importOriginalName: "flexvol1/testLUN1"
    trident.netapp.io/importBackendUUID: "81abcb27-ea63-49bb-b606-0a5315ac5f21"

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[joan-ing]

Thank you for opening this issue @torirevilla. Will start working on this. Appreciate your input 🎉