Fix up paramrefs (System namespace)

[gewarren]

Contributes to #10183

(Hide whitespace changes.)

[learn-build-service-prod]

Learn Build status updates of commit 4a67849:

✅ Validation status: passed

File	Status	Preview URL	Details
xml/index.xml	✅Succeeded
xml/System/Activator.xml	✅Succeeded	View
xml/System/AppDomain.xml	✅Succeeded	View
xml/System/ArgumentException.xml	✅Succeeded	View
xml/System/ArgumentOutOfRangeException.xml	✅Succeeded	View
xml/System/Array.xml	✅Succeeded	View
xml/System/ArraySegment`1.xml	✅Succeeded	View
xml/System/Attribute.xml	✅Succeeded	View
xml/System/Convert.xml	✅Succeeded	View
xml/System/DateTime.xml	✅Succeeded	View
xml/System/DateTimeOffset.xml	✅Succeeded	View
xml/System/Decimal.xml	✅Succeeded	View
xml/System/Delegate.xml	✅Succeeded	View
xml/System/Double.xml	✅Succeeded	View
xml/System/Enum.xml	✅Succeeded	View
xml/System/Environment.xml	✅Succeeded	View
xml/System/Guid.xml	✅Succeeded	View
xml/System/IComparable.xml	✅Succeeded	View
xml/System/Int16.xml	✅Succeeded	View
xml/System/Int32.xml	✅Succeeded	View
xml/System/IntPtr.xml	✅Succeeded	View
xml/System/Lazy`1.xml	✅Succeeded	View
xml/System/Math.xml	✅Succeeded	View
xml/System/MathF.xml	✅Succeeded	View
xml/System/Memory`1.xml	✅Succeeded	View

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[BillWagner]

I admittedly skimmed this, but it looks good.

Let's when ready.

[gewarren]

Thanks @BillWagner