This PR significantly enhances the C# value equality documentation to address critical gaps and technical inaccuracies identified during review, while restructuring code examples for better readability.

Key Improvements

Enhanced Records Documentation

• Clarified how records correctly implement IEquatable<T> using virtual methods that check runtime types
• Renamed "Records with Collections" to "Records with members that use reference equality" for broader applicability
• Improved guidance to cover all reference types except those with value-based equality like string
• Made solutions more actionable with specific implementation guidance

Corrected Polymorphic Equality Explanation

• Fixed misleading explanation that suggested explicit interface implementation "forces" equality comparisons
• Clarified that correct polymorphic behavior comes from proper virtual Equals(object?) override with runtime type checking
• Emphasized that the key is how object.Equals is implemented, not the interface implementation pattern

Restructured Code Examples

• Broke up long, monolithic code samples into focused snippets with targeted explanations
• Added snippet tags with id= syntax to include specific sections: problem demonstration, solution examples, edge cases
• Each code section now has contextual explanation, making complex implementations easier to understand
• Separated logical concerns (problem vs solution, different collection types, polymorphic scenarios)

Content and Style Improvements

• Updated AI usage metadata to "ai-assisted" per documentation guidelines
• Improved conciseness by removing unnecessary introductory words
• Enhanced xref usage patterns (only on first reference)
• Converted bullet points to appropriate prose where needed
• Streamlined content flow and removed redundant information

The documentation now correctly explains the nuances of value equality in inheritance scenarios and provides clear, digestible examples that demonstrate both problematic patterns and their solutions.

Fixes #45164.

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