Refresh chapter 9 of ps101

[mikefrobbins]

PR Summary

Fixes #11700, Fixes AB#364817 - Refresh chapter 9 of ps101

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 eb8eb01:

✅ Validation status: passed

File	Status	Preview URL	Details
reference/docs-conceptual/learn/ps101/09-functions.md	✅Succeeded	View (>=powershell-5.1)

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel

[learn-build-service-prod]

Learn Build status updates of commit 19ee0e0:

✅ Validation status: passed

File	Status	Preview URL	Details
reference/docs-conceptual/learn/ps101/09-functions.md	✅Succeeded	View (>=powershell-5.1)

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel