Remove section calling out using AI to initialize a dictionary

[bdukes]

Summary

I could not come up with any reason that this content was useful to anyone.

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docs/csharp/programming-guide/classes-and-structs/how-to-initialize-a-dictionary-with-a-collection-initializer.md	How to initialize a dictionary with a collection initializer (C# Programming Guide)

[BillWagner]

Thanks @bdukes

The feedback on this example has been less positive than others.

I'll merge this now. You should see the changes on the live site in the next day or two, on our regular publishing cycle.