Fix typo

[changeworld]

PR Summary

Fix typo: PowerSHell -> PowerShell

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.

[learn-build-service-prod]

Learn Build status updates of commit cde099a:

✅ Validation status: passed

File	Status	Preview URL	Details
reference/docs-conceptual/developer/hosting/runspace03-sample.md	✅Succeeded	View (>=powershell-5.1)

For more details, please refer to the build report.

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[github-actions]

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