Corrected a comment to match what the code actually does

[JamesDBartlett3]

PR Summary

Comment said "Method to calculate reading time as 30 seconds per page" but the method actually calculates reading time as 2 minutes per page, so I corrected the comment to match the code.

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][contrib].
• Style: This PR adheres to the [style guide][style].

[learn-build-service-prod]

Learn Build status updates of commit 9777ee4:

✅ Validation status: passed

File	Status	Preview URL	Details
reference/7.5/Microsoft.PowerShell.Core/About/about_Classes.md	✅Succeeded	View (powershell-7.5)

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[github-actions]

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