Improve delegate documentation clarity and beginner-friendliness

[Copilot]

Fixes #25566

Problem

The delegate documentation in docs/csharp/delegate-class.md was confusing for readers, as reported in the original issue:

• Introduced concepts "in a kind of backwards way"
• Made assumptions about prior knowledge
• Used overly terse, technical language
• Was "difficult to grasp" and caused readers to "stop reading"

Solution

Completely rewrote the documentation to be more beginner-friendly while maintaining technical accuracy:

Key Improvements

1. Added conceptual introduction: New "What are delegates?" section explains the concept with relatable analogies before diving into syntax
2. Progressive concept building: Starts with simple examples before complex ones
3. Better flow: Explains "why" before "how" throughout the document
4. Conversational tone: Rewrote technical explanations to be more accessible
5. Improved examples: Added simple Calculator delegate example before the complex List.Sort example

Before/After Comparison

Before:

Let's start with the 'delegate' keyword, because that's primarily what
you will use as you work with delegates. The code that the
compiler generates when you use the `delegate` keyword will
map to method calls that invoke members of the System.Delegate
and System.MulticastDelegate classes.

After:

## What are delegates?

Think of a delegate as a way to store a reference to a method, similar to how you might store a reference to an object. Just as you can pass objects to methods, you can pass method references using delegates. This is incredibly useful when you want to write flexible code where different methods can be "plugged in" to provide different behaviors.

For example, imagine you have a calculator that can perform operations on two numbers...

Structure Changes

• Conceptual before technical: Now starts with "What are delegates?" before syntax
• Simple before complex: Calculator example before List.Sort
• Progressive explanations: Each section builds on the previous one
• Better transitions: Added connecting sentences between concepts

The documentation now follows a logical progression: concept → simple example → practical example → implementation details, making it much more accessible to developers learning about delegates while preserving all technical accuracy.

Validation

• ✅ Passes markdownlint validation
• ✅ Maintains all existing technical content and cross-references
• ✅ Follows Microsoft Writing Style Guide conventions
• ✅ Uses active voice and conversational tone as specified in style guidelines

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[BillWagner]

@copilot Please start working on this again

[BillWagner]

@copilot Can you start working on this again?

[BillWagner]

@copilot Can you start working on this again?