Include the new C# 14 proposals. (#47919)

* Include the new C# 14 proposals.

* Add remaining C# 14 specs

Author: BillWagner

docfx.json

@@ -54,15 +54,7 @@
                     "csharp-11.0/*.md",
                     "csharp-12.0/*.md",
                     "csharp-13.0/*.md",
-                    "field-keyword.md",
-                    "unbound-generic-types-in-nameof.md",
-                    "first-class-span-types.md",
-                    "simple-lambda-parameters-with-modifiers.md",
-                    "partial-events-and-constructors.md",
-                    "null-conditional-assignment.md",
-                    "extensions.md",
-                    "user-defined-compound-assignment.md",
-                    "ignored-directives.md"
+                    "csharp-14.0/*.md"
                 ],
                 "src": "_csharplang/proposals",
                 "dest": "csharp/language-reference/proposals",
@@ -716,6 +708,8 @@
                 "_csharplang/proposals/csharp-14.0/extensions.md": "Extension members",
                 "_csharplang/proposals/csharp-14.0/user-defined-compound-assignment.md": "User-defined compound assignment",
                 "_csharplang/proposals/csharp-14.0/ignored-directives.md": "Ignored preprocessor directives",
+                "_csharplang/proposals/csharp-14.0/extension-operators.md": "Extension operators",
+                "_csharplang/proposals/csharp-14.0/optional-and-named-parameters-in-expression-trees.md": "Optional and named parameters in expression trees",
                 "_roslyn/docs/compilers/CSharp/Compiler Breaking Changes - DotNet 7.md": "C# compiler breaking changes since C# 10",
                 "_roslyn/docs/compilers/CSharp/Compiler Breaking Changes - DotNet 8.md": "C# compiler breaking changes since C# 11",
                 "_roslyn/docs/compilers/CSharp/Compiler Breaking Changes - DotNet 9.md": "C# compiler breaking changes since C# 12",
@@ -842,6 +836,8 @@
                 "_csharplang/proposals/csharp-14.0/extensions.md": "This proposal enables new kinds of extension members. These new extension members support extension properties, extension static members, including extension operators.",
                 "_csharplang/proposals/csharp-14.0/user-defined-compound-assignment.md": "This proposal introduces user-defined compound assignment operators. Developers can override compound assignment, increment, and decrement operators.",
                 "_csharplang/proposals/csharp-14.0/ignored-directives.md": "This proposal allows a source file to include ignored directives. In most cases, ignored directives are used for file based programs, for example `#!`",
+                "_csharplang/proposals/csharp-14.0/extension-operators.md": "This proposal extends the proposal for extensions to include *extension operators*, where an operator can be an extension member.",
+                "_csharplang/proposals/csharp-14.0/named-and-optional-parameters-in-expression-trees.md": "This proposal allows an expression tree to include named and optional parameters. This enables expression trees to be more flexible in how they are constructed.",
                 "_roslyn/docs/compilers/CSharp/Compiler Breaking Changes - DotNet 7.md": "Learn about any breaking changes since the initial release of C# 10 and included in C# 11",
                 "_roslyn/docs/compilers/CSharp/Compiler Breaking Changes - DotNet 8.md": "Learn about any breaking changes since the initial release of C# 11 and included in C# 12",
                 "_roslyn/docs/compilers/CSharp/Compiler Breaking Changes - DotNet 9.md": "Learn about any breaking changes since the initial release of C# 12 and included in C# 13",

docs/csharp/specification/toc.yml

@@ -111,6 +111,8 @@ items:
       href: ../../../_csharplang/proposals/csharp-9.0/native-integers.md
     - name: Numeric IntPtr
       href: ../../../_csharplang/proposals/csharp-11.0/numeric-intptr.md
+    - name: Named and optional parameters in expression trees
+      href: ../../../_csharplang/proposals/csharp-14.0/optional-and-named-parameters-in-expression-trees.md
   - name: Variables
     items:
     - name: Improved definite assignment analysis
@@ -221,6 +223,8 @@ items:
       href: ../../../_csharplang/proposals/csharp-13.0/params-collections.md
     - name: Extension members
       href: ../../../_csharplang/proposals/csharp-14.0/extensions.md
+    - name: Extension operators
+      href: ../../../_csharplang/proposals/csharp-14.0/extension-operators.md
   - name: Structs
     items:
     - name: Parameterless struct constructors