Updating README.md to have correct URLs

[vincepower]

Showing change to examples repo in URLs and adjusting an example to be accurate (and reflect the actual file) where storageClassName: standard is in spec not metadata.

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[vincepower]

This is to address #337

[vincepower]

/assign @idvoretskyi

[idvoretskyi]

/lgtm

/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: idvoretskyi, vincepower

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