Fix typo

[changeworld]

PR Summary

Fix typo: StackOverflow -> Stack Overflow

PR Checklist

• Descriptive Title: This PR's title is a synopsis of the changes it proposes.
• Summary: This PR's summary describes the scope and intent of the change.
• Contributor's Guide: I have read the contributors guide.
• Style: This PR adheres to the style guide.

[github-actions]

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[learn-build-service-prod]

Learn Build status updates of commit 67f46fc:

✅ Validation status: passed

File	Status	Preview URL	Details
reference/docs-conceptual/community/community-support.md	✅Succeeded	View (>=powershell-5.1)
reference/index.yml	✅Succeeded	View

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