Don't refer to C# 11 as "new" anymore

[BillWagner]

Fixes #49591

• Remove "What's new in C# 11"
• Remove phrasing for "beginning in C# 11" or similar to describe features.
• Move C# 11 tutorials out from What's new section.

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📄 File	🔗 Preview link
docs/csharp/advanced-topics/interface-implementation/static-virtual-interface-members.md	Tutorial: Explore static virtual members in interfaces
docs/csharp/advanced-topics/reflection-and-attributes/generics-and-attributes.md	"Generics and attributes"
docs/csharp/fundamentals/functional/pattern-matching.md	Pattern matching overview
docs/csharp/fundamentals/types/interfaces.md	Interfaces - define behavior for multiple types
docs/csharp/language-reference/attributes/caller-information.md	docs/csharp/language-reference/attributes/caller-information
docs/csharp/language-reference/attributes/nullable-analysis.md	Attributes for null-state static analysis interpreted by the C# compiler
docs/csharp/language-reference/builtin-types/default-values.md	"Default values of built-in types"
docs/csharp/language-reference/builtin-types/integral-numeric-types.md	Integral numeric types (C# reference)
docs/csharp/language-reference/builtin-types/ref-struct.md	docs/csharp/language-reference/builtin-types/ref-struct
docs/csharp/language-reference/builtin-types/reference-types.md	Built-in reference types (C# reference)
docs/csharp/language-reference/builtin-types/struct.md	"Structure types"
docs/csharp/language-reference/keywords/file.md	The file modifier
docs/csharp/language-reference/keywords/interface.md	:::no-loc text="interface"::: (C# Reference)
docs/csharp/language-reference/operators/addition-operator.md	Addition operators - + and +=
docs/csharp/language-reference/operators/arithmetic-operators.md	Arithmetic operators (C# reference)
docs/csharp/language-reference/operators/bitwise-and-shift-operators.md	Bitwise and shift operators (C# reference)
docs/csharp/language-reference/operators/delegate-operator.md	docs/csharp/language-reference/operators/delegate-operator
docs/csharp/language-reference/operators/is.md	The is operator (C# reference)
docs/csharp/language-reference/operators/nameof.md	"The nameof expression - evaluate the text name of a symbol"
docs/csharp/language-reference/operators/patterns.md	Pattern matching - the is and switch expressions, and operators and, or, and not in patterns
docs/csharp/language-reference/operators/user-defined-conversion-operators.md	docs/csharp/language-reference/operators/user-defined-conversion-operators
docs/csharp/language-reference/statements/checked-and-unchecked.md	The checked and unchecked statements (C# reference)
docs/csharp/language-reference/tokens/interpolated.md	"$ - string interpolation - format string output"
docs/csharp/language-reference/tokens/raw-string.md	Raw string literal text - """ in string literals
docs/csharp/programming-guide/classes-and-structs/properties.md	docs/csharp/programming-guide/classes-and-structs/properties
docs/csharp/programming-guide/generics/generic-interfaces.md	Generic Interfaces (C# Programming Guide)
docs/csharp/programming-guide/strings/index.md	"Strings"
docs/csharp/toc.yml	Taken from https://github.com/dotnet/roslyn/wiki/Samples-and-Walkthroughs
docs/csharp/tutorials/nullable-reference-types.md	docs/csharp/tutorials/nullable-reference-types
docs/csharp/whats-new/csharp-version-history.md	The history of C#

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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.

[Copilot]

Pull Request Overview

This PR removes references to C# 11 as a "new" feature to better reflect its current maturity. The changes update documentation across multiple files to use present-tense language instead of "beginning with C# 11" phrasing, consolidate C# 11 features into the version history page, delete the standalone C# 11 article, and reorganize tutorials by moving static virtual interface members content to the advanced topics section.

Reviewed Changes

Copilot reviewed 42 out of 47 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
docs/csharp/whats-new/csharp-version-history.md	Updated to add C# 14, consolidate C# 11 features with links to main docs
docs/csharp/whats-new/csharp-11.md	Deleted - content moved to version history
docs/csharp/toc.yml	Reorganized breaking changes section, moved static interface tutorial
docs/csharp/tutorials/*.md	Removed "beginning with C# 11" phrasing
docs/csharp/language-reference/**/*.md	Updated to remove C# 11 temporal references throughout
docs/csharp/programming-guide/**/*.md	Removed "beginning with C# 11" phrasing
docs/csharp/fundamentals/**/*.md	Updated temporal language references
docs/csharp/advanced-topics/**/*.md	Moved static-virtual-interface-members.md, updated references
.openpublishing.redirection.csharp.json	Added redirects for moved/deleted C# 11 content
docs/core/whats-new/dotnet-7.md	Updated C# 11 link to version history
docs/core/compatibility/core-libraries/6.0/*.md	Updated static interface tutorial link