Add include to help readers find the initial version

[BillWagner]

Fixes #50891

Commit-by-commit:

• Create include file
• Add include to the articles in the attributes folder.
• Add include to the articles in the builtin-types folder.
• Add include to the articles in the tokens folder.

---

Internal previews

Toggle expand/collapse

📄 File	🔗 Preview link
docs/csharp/language-reference/attributes/caller-information.md	Determine caller information by using attributes that the C# compiler interprets
docs/csharp/language-reference/attributes/general.md	"Attributes interpreted by the compiler: Miscellaneous"
docs/csharp/language-reference/attributes/global.md	Assembly level attributes interpreted by the C# compiler
docs/csharp/language-reference/attributes/nullable-analysis.md	docs/csharp/language-reference/attributes/nullable-analysis
docs/csharp/language-reference/attributes/pseudo-attributes.md	Custom attributes that generate flags or options in the Intermediate Language (IL) output
docs/csharp/language-reference/builtin-types/arrays.md	Arrays
docs/csharp/language-reference/builtin-types/bool.md	"bool type"
docs/csharp/language-reference/builtin-types/built-in-types.md	Built-in types (C# reference)
docs/csharp/language-reference/builtin-types/char.md	docs/csharp/language-reference/builtin-types/char
docs/csharp/language-reference/builtin-types/collections.md	Collections
docs/csharp/language-reference/builtin-types/default-values.md	"Default values of built-in types"
docs/csharp/language-reference/builtin-types/enum.md	Enumeration types (C# reference)
docs/csharp/language-reference/builtin-types/floating-point-numeric-types.md	Floating-point numeric types (C# reference)
docs/csharp/language-reference/builtin-types/integral-numeric-types.md	Integral numeric types (C# reference)
docs/csharp/language-reference/builtin-types/nullable-reference-types.md	docs/csharp/language-reference/builtin-types/nullable-reference-types
docs/csharp/language-reference/builtin-types/nullable-value-types.md	Nullable value types (C# reference)
docs/csharp/language-reference/builtin-types/numeric-conversions.md	Built-in numeric conversions (C# reference)
docs/csharp/language-reference/builtin-types/ref-struct.md	"ref struct types"
docs/csharp/language-reference/builtin-types/reference-types.md	Built-in reference types (C# reference)
docs/csharp/language-reference/builtin-types/struct.md	docs/csharp/language-reference/builtin-types/struct
docs/csharp/language-reference/builtin-types/unmanaged-types.md	Unmanaged types (C# reference)
docs/csharp/language-reference/builtin-types/value-tuples.md	Tuple types (C# reference)
docs/csharp/language-reference/builtin-types/value-types.md	"Value types"
docs/csharp/language-reference/builtin-types/void.md	void (C# reference)
docs/csharp/language-reference/tokens/comments.md	docs/csharp/language-reference/tokens/comments
docs/csharp/language-reference/tokens/discard.md	Discard - A _ acts as a placeholder for a variable
docs/csharp/language-reference/tokens/index.md	C# special characters
docs/csharp/language-reference/tokens/interpolated.md	String interpolation using $
docs/csharp/language-reference/tokens/raw-string.md	"Raw string literals - """"
docs/csharp/language-reference/tokens/verbatim.md	Verbatim text - @ in variables, attributes, and string literals

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]

Other folders will be added in later PRs.

[Copilot]

Pull request overview

This PR adds a reusable include file that helps readers find when C# features were first introduced. The include is added to 33 documentation files across the attributes, builtin-types, and tokens folders to provide consistent information about C# language version history.

Changes:

• Created a new include file (initial-version.md) explaining how to find feature introduction versions
• Added the include to all files in the attributes, builtin-types, and tokens folders
• Updated dates to 01/14/2026 across all modified files
• Made minor text improvements for clarity and consistency with documentation guidelines

Reviewed changes

Copilot reviewed 32 out of 32 changed files in this pull request and generated 5 comments.

File	Description
docs/csharp/language-reference/includes/initial-version.md	New include file directing readers to C# version history
docs/csharp/language-reference/attributes/*.md (5 files)	Added include and updated dates
docs/csharp/language-reference/builtin-types/*.md (20 files)	Added include, updated dates, minor text improvements
docs/csharp/language-reference/tokens/*.md (7 files)	Added include, updated dates, code snippet syntax updates

[meaghanlewis]

LGTM. Just a handful of minor suggestions.