Max<TSource>(IEnumerable<TSource>) "Exceptions" doc is missing ArgumentException

When the source has at least two elements and none of them implement IComparable, an ArgumentException is thrown. This is not documented in the Exceptions section of the `Max<TSource>(IEnumerable<TSource>)` overload.

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* ID: ff6c5327-869d-670c-aca4-710511a2fc72
* Version Independent ID: 422bf5c0-9b03-1bed-adbf-d4c3b375815d
* Content: [Enumerable.Max Method (System.Linq)](https://docs.microsoft.com/en-us/dotnet/api/system.linq.enumerable.max?view=netframework-4.7.1#System_Linq_Enumerable_Max__1_System_Collections_Generic_IEnumerable___0__)
* 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**