Add support for nameof for open generic types, first class span implicit conversions, and implicit lambda parameters with modifiers

[BillWagner]

• Fixes [C# 14-Fundamentals and reference]: New Feature - nameof supports unbound generic types #44182: Add that nameof now supports open generic types.
• Fixes [C# 14-Fundamentals and reference]: New Feature - First class span #44183: Add the new implicit span conversions that are added in .NET 10 / C# 14.
• Fixes [C# 14-Fundamentals and reference]: New Feature - Simple lambda parameter with modifiers #44887: Publish the speclet and update the language reference to allow modifiers on implicitly typed lambda expressions.

This is the first C# 14 feature I've added, so create the C# 14 file, and update the language version tables accordingly.

Many of the files that have been updated are updating links and anchors. Major changes are:

📄 File	🔗 Preview link
docs/csharp/language-reference/builtin-types/built-in-types.md	"Built-in types"
docs/csharp/language-reference/operators/lambda-expressions.md	docs/csharp/language-reference/operators/lambda-expressions
docs/csharp/language-reference/operators/lambda-operator.md	Lambda expression (=>) operator defines a lambda expression
docs/csharp/language-reference/operators/nameof.md	"The nameof expression - evaluate the text name of a symbol"
docs/csharp/language-reference/operators/type-testing-and-cast.md	Type-testing operators and cast expressions - is, as, typeof, and casts
docs/csharp/language-reference/operators/user-defined-conversion-operators.md	"User-defined explicit and implicit conversion operators - provide conversions to different types"
docs/csharp/programming-guide/types/casting-and-type-conversions.md	Casting and type conversions (C# Programming Guide)
docs/csharp/whats-new/csharp-14.md	What's new in C# 14

---

Internal previews

Toggle expand/collapse

📄 File	🔗 Preview link
.github/workflows/snippets5000.yml	Controls when the action will run. Triggers the workflow on push or pull request
docs/csharp/fundamentals/tutorials/safely-cast-using-pattern-matching-is-and-as-operators.md	How to safely cast by using pattern matching and the is and as operators
docs/csharp/index.yml	highlightedContent section (Optional; Remove if not applicable.)
docs/csharp/language-reference/builtin-types/built-in-types.md	"Built-in types"
docs/csharp/language-reference/builtin-types/collections.md	Collections
docs/csharp/language-reference/builtin-types/nullable-value-types.md	docs/csharp/language-reference/builtin-types/nullable-value-types
docs/csharp/language-reference/compiler-messages/assembly-references.md	Resolve errors and warnings related to assembly references
docs/csharp/language-reference/compiler-messages/cs0039.md	"Compiler Error CS0039"
docs/csharp/language-reference/compiler-messages/cs0413.md	Compiler Error CS0413
docs/csharp/language-reference/compiler-messages/params-arrays.md	Errors and warnings related to the params modifier on method parameters
docs/csharp/language-reference/configure-language-version.md	docs/csharp/language-reference/configure-language-version
docs/csharp/language-reference/keywords/index.md	C# Keywords
docs/csharp/language-reference/operators/index.md	"Operators and expressions - List all operators and expression"
docs/csharp/language-reference/operators/is.md	is operator (C# reference)
docs/csharp/language-reference/operators/lambda-expressions.md	docs/csharp/language-reference/operators/lambda-expressions
docs/csharp/language-reference/operators/lambda-operator.md	Lambda expression (=>) operator defines a lambda expression
docs/csharp/language-reference/operators/nameof.md	"The nameof expression - evaluate the text name of a symbol"
docs/csharp/language-reference/operators/operator-overloading.md	Operator overloading - predefined unary, arithmetic, equality and comparison operators
docs/csharp/language-reference/operators/patterns.md	docs/csharp/language-reference/operators/patterns
docs/csharp/language-reference/operators/type-testing-and-cast.md	Type-testing operators and cast expressions - is, as, typeof, and casts
docs/csharp/language-reference/operators/user-defined-conversion-operators.md	"User-defined explicit and implicit conversion operators - provide conversions to different types"
docs/csharp/language-reference/statements/lock.md	The lock statement - ensure exclusive access to a shared resource
docs/csharp/misc/cs0077.md	docs/csharp/misc/cs0077
docs/csharp/misc/cs0244.md	Compiler Error CS0244
docs/csharp/misc/cs0837.md	Compiler Error CS0837
docs/csharp/programming-guide/types/casting-and-type-conversions.md	Casting and type conversions (C# Programming Guide)
docs/csharp/specification/toc.yml	docs/csharp/specification/toc
docs/csharp/toc.yml	Taken from https://github.com/dotnet/roslyn/wiki/Samples-and-Walkthroughs
docs/csharp/whats-new/csharp-11.md	What's new in C# 11
docs/fundamentals/code-analysis/style-rules/ide0082.md	Convert typeof to nameof (IDE0082)

Note

This table shows preview links for the 30 files with the most changes. For preview links for other files in this PR, select OpenPublishing.Build Details within checks.

[BillWagner]

Let's hold this until the first .NET 10 preview comes out.

That will fix the snippets 5000 build, and the new example will compile.

[BillWagner]

@CamSoper This is ready for review. The snippets build will pass once .NET 10 preview 1 is public. I'd like to merge it once that's available.