docs/resource-filtering missing VolumeAttributes in Resource Policy

[kaovilai]

          https://velero.io/docs/v1.15/resource-filtering/#supported-volumepolicy-actions should be updated from this PR as well.

Originally posted by @kaovilai in #8383 (comment)

[kaovilai]

cc: @mayankagg9722 @anshulahuja98

[sseago]

@kaovilai https://velero.io/docs/v1.15/resource-filtering/#supported-conditions is where the change would go.

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