Continue adding version include

[BillWagner]

Contributes to #50891

Commit by commit:

1. C# Guide root folder
2. XMLDocs folder
3. Statements folder
4. build warnings
5. Copilot feedback

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Internal previews

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📄 File	🔗 Preview link
docs/csharp/language-reference/configure-language-version.md	Configure C# language version
docs/csharp/language-reference/language-versioning.md	Language versioning
docs/csharp/language-reference/preprocessor-directives.md	C# preprocessor directives
docs/csharp/language-reference/statements/checked-and-unchecked.md	docs/csharp/language-reference/statements/checked-and-unchecked
docs/csharp/language-reference/statements/declarations.md	Declaration statements
docs/csharp/language-reference/statements/exception-handling-statements.md	Exception-handling statements - throw, try-catch, try-finally, and try-catch-finally
docs/csharp/language-reference/statements/fixed.md	"fixed statement - pin a moveable variable"
docs/csharp/language-reference/statements/iteration-statements.md	Iteration statements - for, foreach, do, and while
docs/csharp/language-reference/statements/jump-statements.md	docs/csharp/language-reference/statements/jump-statements
docs/csharp/language-reference/statements/lock.md	The lock statement - ensure exclusive access to a shared resource
docs/csharp/language-reference/statements/selection-statements.md	Selection statements - if, if-else, and switch
docs/csharp/language-reference/statements/using.md	"using statement - ensure the correct use of disposable objects"
docs/csharp/language-reference/statements/yield.md	yield statement - provide the next element
docs/csharp/language-reference/unsafe-code.md	Unsafe code, pointer types, and function pointers
docs/csharp/language-reference/xmldoc/examples.md	docs/csharp/language-reference/xmldoc/examples
docs/csharp/language-reference/xmldoc/index.md	Generate XML API documentation comments
docs/csharp/language-reference/xmldoc/recommended-tags.md	Recommended XML tags for C# documentation comments

[Copilot]

Pull request overview

This PR continues the work of adding version include notes to C# documentation files. The changes focus on two main areas: the C# Guide root folder and the XMLDocs folder. The PR adds the [!INCLUDE[csharp-version-note](../includes/initial-version.md)] directive to all modified files and makes numerous style improvements to align with the Microsoft documentation guidelines.

Changes:

• Added version include notes to 17 C# language reference documentation files
• Updated dates across all files to reflect current or near-current dates
• Improved writing style throughout to use active voice, imperative mood, and second person ("you")
• Enhanced clarity and readability by converting passive constructions to active ones

Reviewed changes

Copilot reviewed 17 out of 17 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
recommended-tags.md	Added version note; improved style with active voice and imperative mood throughout XML tag documentation
index.md	Added version note; enhanced clarity in XML documentation comments overview
examples.md	Added version note; refined language for XML documentation examples
unsafe-code.md	Added version note; improved explanations of unsafe code, pointers, and function pointers
yield.md	Added version note; clarified yield statement usage in iterators
using.md	Added version note; improved using statement documentation
selection-statements.md	Added version note; enhanced if/switch statement explanations
lock.md	Added version note; clarified lock statement behavior
jump-statements.md	Added version note; improved jump statement documentation
iteration-statements.md	Added version note; refined iteration statement explanations
fixed.md	Added version note; clarified fixed statement usage
exception-handling-statements.md	Added version note; improved exception handling documentation
declarations.md	Added version note; enhanced declaration statement explanations
checked-and-unchecked.md	Added version note; clarified overflow-checking context
preprocessor-directives.md	Added version note; improved preprocessor directive documentation with one critical error
language-versioning.md	Added version note; updated Visual Studio compatibility reference
configure-language-version.md	Added version note; refined language version configuration guidance