docs(samples): adding sample for local SSD disk

[m-strzelczyk]

Adding sample code for including a local SSD in an instance.

[snippet-bot]

Here is the summary of changes.

You are about to add 1 region tag.

• samples/snippets/instances/create_start_instance/create_with_local_ssd.py:22, tag compute_instances_create_with_local_ssd

---

This comment is generated by snippet-bot.
If you find problems with this result, please file an issue at:
https://github.com/googleapis/repo-automation-bots/issues.
To update this comment, add snippet-bot:force-run label or use the checkbox below:

• Refresh this comment

[gcf-merge-on-green]

Merge-on-green attempted to merge your PR for 6 hours, but it was not mergeable because either one of your required status checks failed, one of your required reviews was not approved, or there is a do not merge label. Learn more about your required status checks here: https://help.github.com/en/github/administering-a-repository/enabling-required-status-checks. You can remove and reapply the label to re-run the bot.