Unpublish C# 8 patterns

[BillWagner]

The ECMA committee merged dotnet/csharpstandard#873

Now, remove the feature spec from publication.

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📄 File	🔗 Preview link
docs/csharp/language-reference/builtin-types/enum.md	Enumeration types (C# reference)
docs/csharp/language-reference/builtin-types/nullable-reference-types.md	"Nullable reference types"
docs/csharp/language-reference/builtin-types/struct.md	Structure types (C# reference)
docs/csharp/language-reference/compiler-messages/overloaded-operator-errors.md	Errors and warnings for overloaded, or user-defined operator declarations
docs/csharp/language-reference/keywords/const.md	"The const keyword"
docs/csharp/language-reference/keywords/interface.md	:::no-loc text="interface"::: (C# Reference)
docs/csharp/language-reference/keywords/readonly.md	docs/csharp/language-reference/keywords/readonly
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/assignment-operator.md	"Assignment operators - assign an expression to a variable"
docs/csharp/language-reference/operators/bitwise-and-shift-operators.md	Bitwise and shift operators (C# reference)
docs/csharp/language-reference/operators/boolean-logical-operators.md	docs/csharp/language-reference/operators/boolean-logical-operators
docs/csharp/language-reference/operators/comparison-operators.md	Comparison operators (C# reference)
docs/csharp/language-reference/operators/conditional-operator.md	"?: operator - the ternary conditional operator"
docs/csharp/language-reference/operators/delegate-operator.md	delegate operator
docs/csharp/language-reference/operators/equality-operators.md	Equality operators - test if two objects are equal or not
docs/csharp/language-reference/operators/is.md	docs/csharp/language-reference/operators/is
docs/csharp/language-reference/operators/lambda-expressions.md	Lambda expressions and anonymous functions
docs/csharp/language-reference/operators/lambda-operator.md	"The lambda operator - The => operator is used to define a lambda expression"
docs/csharp/language-reference/operators/null-coalescing-operator.md	?? and ??= operators - the null-coalescing operators
docs/csharp/language-reference/operators/operator-overloading.md	docs/csharp/language-reference/operators/operator-overloading
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/subtraction-operator.md	"- and -= operators - subtraction (minus) operators"
docs/csharp/language-reference/operators/switch-expression.md	switch expression - pattern matching expressions using the switch keyword
docs/csharp/language-reference/operators/true-false-operators.md	docs/csharp/language-reference/operators/true-false-operators
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/statements/iteration-statements.md	"Iteration statements -for, foreach, do, and while"
docs/csharp/linq/index.md	Language Integrated Query (LINQ)
docs/csharp/specification/toc.yml	docs/csharp/specification/toc
docs/fundamentals/code-analysis/style-rules/ide0110.md	Remove unnecessary discard (IDE0110)

[Copilot]

Pull Request Overview

This pull request updates documentation links to migrate from C# 8.0 feature proposal references to the C# language specification. The changes primarily replace links pointing to _csharplang/proposals/csharp-8.0/ with corresponding links to _csharpstandard/standard/ sections, and update section numbers throughout the documentation to reflect the current specification structure.

Key changes:

• Replace C# 8.0 feature proposal links with standardized specification references for patterns, operators, and language features.
• Update section numbers in C# language specification links to match current numbering (for example, #1213 to #1214 for relational operators).
• Remove C# 8.0-specific content from docfx.json configuration and table of contents files.
• Clean up redirection entries for deprecated C# 8.0 proposal pages.

Reviewed Changes

Copilot reviewed 32 out of 32 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
docs/fundamentals/code-analysis/style-rules/ide0110.md	Updated discard pattern link from C# 8.0 proposal to specification
docs/csharp/specification/toc.yml	Removed "Recursive pattern matching" entry from patterns section
docs/csharp/linq/index.md	Updated query expressions section number reference
docs/csharp/language-reference/statements/iteration-statements.md	Removed async streams feature proposal reference
docs/csharp/language-reference/operators/*.md	Updated multiple operator specification section numbers
docs/csharp/language-reference/keywords/*.md	Updated specification references and removed C# 8.0 proposal links
docs/csharp/language-reference/builtin-types/*.md	Updated type specification references
docfx.json	Removed C# 8.0 file patterns and metadata entries
.openpublishing.redirection.csharp.json	Removed C# 8.0 redirection entries