Update region tags for create_instance

[duncantech]

Description

Internal: b/347824896

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Checklist

• [x] I have followed Sample Guidelines from AUTHORING_GUIDE.MD
• [x] README is updated to include all relevant information
• [x] Tests pass: nox -s py-3.9 (see Test Environment Setup)
• [x] Lint pass: nox -s lint (see Test Environment Setup)
• [ ] These samples need a new API enabled in testing projects to pass (let us know which ones)
• [ ] These samples need a new/updated env vars in testing projects set to pass (let us know which ones)
• [ ] This sample adds a new sample directory, and I updated the CODEOWNERS file with the codeowners for this sample
• [ ] This sample adds a new Product API, and I updated the Blunderbuss issue/PR auto-assigner with the codeowners for this sample
• [ ] Please merge this PR for me once it is approved

[snippet-bot[bot]]

Here is the summary of possible violations 😱

There is a possible violation for removing region tag in use.

• compute/api/create_instance.py:57, tag create_instance(usage: page 1).

The end of the violation section. All the stuff below is FYI purposes only.

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Here is the summary of changes.

You are about to add 1 region tag.

- [compute/api/create_instance.py:57](https://github.com/duncantech/python-docs-samples/blob/efc50a2295b9510fd78e3df14f2a86b09ad6f2af/compute/api/create_instance.py#L57), tag `compute_create_instance`

You are about to delete 1 region tag.

- [compute/api/create_instance.py:57](https://github.com/GoogleCloudPlatform/python-docs-samples/blob/db933e522f38b88fefb719ee4dc8e7bce3d812cd/compute/api/create_instance.py#L57), tag `create_instance`

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[davidcavazos]

Is this region tag used in documentation? If so, we might want to create a new region tag within the same file, then update the documentation to use the new region tag, and then delete the old region tag. If it's not used, we could get rid of the region tag or even the code sample altogether.