Add params collections

[BillWagner]

Update descriptions for the params modifier to allow collections.

Contributes to #40005

This might be easiest to review commit by commit:

1. Update What's new, language reference, and programming guide where params is mentioned. Search the content for params and make updates as needed.
2. Review articles and samples with smaller scope changes. A general edit pass.
3. Review methods.md: Major edit pass, move samples and trim unused samples. Small updates to the sample code.
4. Review programming-guide Object Initializers article: Major edit pass, move samples. Small updates to the samples.
5. Fix warnings from related samples moving.
6. Bug fix: Fixes Confusing C# 13 example #40796

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Internal previews

📄 File	🔗 Preview link
docs/csharp/language-reference/keywords/method-parameters.md	Method Parameters
docs/csharp/language-reference/operators/lambda-expressions.md	"Lambda expressions - Lambda expressions and anonymous functions"
docs/csharp/methods.md	Methods in C#
docs/csharp/misc/cs0225.md	Compiler Error CS0225
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)
docs/csharp/programming-guide/classes-and-structs/how-to-initialize-objects-by-using-an-object-initializer.md	docs/csharp/programming-guide/classes-and-structs/how-to-initialize-objects-by-using-an-object-initializer
docs/csharp/programming-guide/classes-and-structs/object-and-collection-initializers.md	Object and Collection Initializers (C# Programming Guide)
docs/csharp/whats-new/csharp-13.md	What's new in C# 13