Order of TElements in ILookup<TKey, TElement>

`GroupBy` explicitly states the order of the elements in each `IGroup`

> The IGrouping objects are yielded in an order based on the order of the elements in source that produced the first key of each IGrouping. Elements in a grouping are yielded in the order that the elements that produced them appear in source.

What is the order for `ILookup`?

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* ID: bf6b73de-2f5d-ec35-a010-c54207af6164
* Version Independent ID: b7c784b6-0318-f929-bfaa-e9fcbbd519c4
* Content: [Enumerable.ToLookup Method (System.Linq)](https://docs.microsoft.com/en-us/dotnet/api/system.linq.enumerable.tolookup?view=netframework-4.7.2)
* Content Source: [xml/System.Linq/Enumerable.xml](https://github.com/dotnet/dotnet-api-docs/blob/master/xml/System.Linq/Enumerable.xml)
* Product: **dotnet-api**
* GitHub Login: @dotnet-bot
* Microsoft Alias: **dotnetcontent**

Apri xml/System.Linq/Enumerable.xml alla documentazione di ToLookup collegata nell’issue e confronta la formulazione attuale con la garanzia sull’ordine citata di GroupBy. Conferma il comportamento applicabile relativo all’ordine di ILookup, quindi aggiorna la documentazione di ToLookup in modo che la garanzia sull’ordine sia esplicita e verifica la pagina API renderizzata.

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