Load(XmlReader) when XmlReader was newly created with .ReadSubtree()

Documentation should note that when calling XElement.Load(subReader) where subReader was previously created with subReader= myReader.ReadSubtree() you may receive an error "The XmlReader state should be EndOfFile after this operation.".

To work around this problem, you can call XElement.Load(subReader.ReadSubtree())

See: https://stackoverflow.com/a/5510781

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* ID: 7a68c44a-8022-ea78-b925-8c9f3bb84086
* Version Independent ID: 7daa0c33-a14d-5f14-8ece-b85903f94d0e
* Content: [XElement.Load Method (System.Xml.Linq)](https://docs.microsoft.com/en-us/dotnet/api/system.xml.linq.xelement.load?view=netframework-4.7.2)
* Content Source: [xml/System.Xml.Linq/XElement.xml](https://github.com/dotnet/dotnet-api-docs/blob/master/xml/System.Xml.Linq/XElement.xml)
* Product: **dotnet-api**
* GitHub Login: @dotnet-bot
* Microsoft Alias: **dotnetcontent**

Esamina la documentazione di XElement.Load in xml/System.Xml.Linq/XElement.xml, in particolare l’overload descritto nell’issue. Verifica lo scenario ReadSubtree e documenta l’errore segnalato e la soluzione alternativa; il lavoro è completato quando la pagina dell’API spiega chiaramente sia la situazione sia la chiamata suggerita.

Scritto dal modello di indicizzazione a partire dal testo della issue.