Update Expression.xml

[NetMage]

Summary

Correct Expression.PropertyOrField description to indicate static properties or fields are not supported.

Fixes #Issue_Number (if available)

[opbld31]

Docs Build status updates of commit b855bd6:

✅ Validation status: passed

File	Status	Preview URL	Details
xml/System.Linq.Expressions/Expression.xml	✅Succeeded	View

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[eiriktsarpalis]

@gewarren any objections to merging this?

[gewarren]

@gewarren any objections to merging this?

Thanks for the ping!