Fixed some syntax issues in Demo0

[Yun-Ting]

Fixes #
Design discussion issue #

Changes

Please provide a brief description of the changes here.

Merge requirement checklist

• CONTRIBUTING guidelines followed.
• Unit tests added/updated (if applicable).

[Copilot]

Pull Request Overview

This PR fixes various syntax and grammatical issues in the Demo 0 documentation about Durable IDs. The changes improve readability and consistency throughout the document while correcting several punctuation, spacing, and terminology errors.

• Fixed apostrophe usage in "ID's" → "IDs" throughout the document
• Corrected grammatical errors including punctuation, spacing, and word choice
• Added proper markdown formatting and links to Microsoft documentation

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