Fixes #10688 - Add about_Type_Conversion article

[sdwheeler]

PR Summary

Add about_Type_Conversion article

• Fixes AB#351599
• Fixes Create an about_Type_Conversions conceptual help topic that describes PowerShell's unusually flexible and automatic type conversions #10688

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 f4281d5:

✅ Validation status: passed

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

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

[mikefrobbins]

See my comments.

[learn-build-service-prod]

Learn Build status updates of commit bdec045:

✅ Validation status: passed

File	Status	Preview URL	Details
reference/5.1/Microsoft.PowerShell.Core/About/about_Type_Conversion.md	✅Succeeded	View (powershell-5.1)
reference/7.4/Microsoft.PowerShell.Core/About/about_Type_Conversion.md	✅Succeeded	View (powershell-7.4)
reference/7.5/Microsoft.PowerShell.Core/About/about_Type_Conversion.md	✅Succeeded	View (powershell-7.5)

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