docs(compute-samples): improving snapshot samples

[Sita04]

Improving the code snippets for disk snapshots, so they can be used on this page: Create and manage disk snapshots

[snippet-bot]

Here is the summary of changes.

You are about to add 2 region tags.

• compute/cloud-client/src/main/java/compute/disks/DeleteSnapshotsByFilter.java:15, tag compute_snapshot_delete_by_filter
• compute/cloud-client/src/main/java/compute/disks/GetSnapshot.java:15, tag compute_snapshot_get

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