Add compute_create_instance region tag

[duncantech]

Description

Fixes #

Note: Before submitting a pull request, please open an issue for discussion if you are not associated with Google.

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
• [x] 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/c3161611ca7f7e5e7d431d91bf8a28ae55584d41/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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