[docs] add missing parameters to StorageClass in multi-region-clouds.md

[clsv]

Added missing parameters csi.storage.k8s.io/controller-expand-secret-name and csi.storage.k8s.io/controller-expand-secret-namespace to the StorageClass configuration in the Multi-AZ/Region/OpenStack documentation. These parameters were missing, causing issues with PVC expansion. After some time spent troubleshooting, I found these parameters in the Kubernetes CSI documentation on StorageClass secrets. After adding them, PVC expansion works as expected.

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[linux-foundation-easycla]

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[kayrus]

/ok-to-test

[clsv]

It looks like all tests are okay. :-)