doc: Fix note on changed property name.

[LennartCode]

Description

The name of the property has been changed but the migration implied, it had stayed the same.

Motivation and Context

Have correct migration information available at a glance.

Fixes #

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Performance improvement
• Code refactoring (no functional changes)

Checklist

• I have read the CONTRIBUTING guidelines
• My code follows the project's code style
• I have added tests that prove my fix/feature works
• All new and existing tests pass (dotnet test)
• I have updated documentation as needed
• My changes generate no new warnings

Testing

No tests required.

Additional Notes

Nothing to add.

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[decriptor]

Thanks!