What if a binary search is going to be performed in an empty array?

The function returns `-1`. Shouldn't it be specifically mentioned? It is quite important in my opinion.

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* ID: 23a54b61-3aff-2dfd-9520-190191a516e4
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* Content: [Array.BinarySearch Method (System)](https://docs.microsoft.com/en-us/dotnet/api/system.array.binarysearch?view=netframework-4.7.2#System_Array_BinarySearch_System_Array_System_Int32_System_Int32_System_Object_System_Collections_IComparer_)
* Content Source: [xml/System/Array.xml](https://github.com/dotnet/dotnet-api-docs/blob/master/xml/System/Array.xml)
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