Remove comment from DataTable.Rows returning null

[vcsjones]

Summary

DataTable.Rows contained a remark about returning null if there are no rows. Best of my knowledge, this property will never return null on .NET Core / 5 or in .NET Framework.

[opbld30]

Docs Build status updates of commit a414b45:

✅ Validation status: passed

File	Status	Preview URL	Details
xml/System.Data/DataTable.xml	✅Succeeded	View

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[David-Engel]

It appears that way to me, too. @roji would be a good authoritative reviewer for this, though.

[roji]

LGTM, DataTable.Rows doesn't seem like it can ever return null, and has been annotated accordingly for C# NRTs in .NET 5.0.