Updated example for as plain text rule

[mikefrobbins]

PR Summary

Fixes AB#302222 - Updated example for as plain text rule

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 924d3b4:

✅ Validation status: passed

File	Status	Preview URL	Details
reference/docs-conceptual/PSScriptAnalyzer/Rules/AvoidUsingConvertToSecureStringWithPlainText.md	✅Succeeded	View (ps-modules)

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