Corrects missing `is_shareable` attribute in results from data source `oci_core_volume_attachments` #2191

[jeliker1]

Data source oci_core_volume_attachments is missing is_shareable attribute so that it returns false for all results. This change adds the missing attribute and updates related documentation to indicate inclusion of the attribute.

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[tf-oci-pub]

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[jeliker1]

@tf-oci-pub hoping someone has opportunity for review. I think the change is quite simple and logical making me think the review ought to be a low-effort task.

[jeliker1]

Looks like this got fixed through other means and pull request is no longer necessary. Can you confirm?