Remove supplemental API remarks

docs/core/compatibility/core-libraries/8.0/complex-format.md

@@ -39,4 +39,4 @@ If you need the previous format, you can use a custom string formatting mechanis
 
 ## See also
 
-- [Format a complex number](../../../../fundamentals/runtime-libraries/system-numerics-complex.md#format-a-complex-number)
+- [Format a complex number](xref:System.Numerics.Complex#format-a-complex-number)

docs/core/porting/net-framework-tech-unavailable.md

@@ -59,9 +59,9 @@ Windows Workflow Foundation (WF) is not supported in .NET 6+. For an alternative
 - <xref:System.Reflection.Emit.AssemblyBuilderAccess.RunAndSave>
 - <xref:System.Reflection.Emit.AssemblyBuilderAccess.Save>
 
-In .NET 9, a `PersistedAssemblyBuilder` was implemented and the <xref:System.Reflection.Emit.AssemblyBuilder.Save*?displayProperty=nameWithType> method was added back to the reflection emit library. To learn more about how to use this API, see [System.Reflection.Emit.PersistedAssemblyBuilder class](../../fundamentals/runtime-libraries/system-reflection-emit-persistedassemblybuilder.md).
+In .NET 9, a `PersistedAssemblyBuilder` was implemented and the <xref:System.Reflection.Emit.AssemblyBuilder.Save*?displayProperty=nameWithType> method was added back to the reflection emit library. To learn more about how to use this API, see <xref:System.Reflection.Emit.PersistedAssemblyBuilder>.
 
-For more information about the different AssemblyBuilder implementations in .NET, see [System.Reflection.Emit.AssemblyBuilder class](../../fundamentals/runtime-libraries/system-reflection-emit-assemblybuilder.md).
+For more information about the different AssemblyBuilder implementations in .NET, see <xref:System.Reflection.Emit.AssemblyBuilder>.
 
 ## Loading multi-module assemblies
 

docs/core/whats-new/dotnet-9/libraries.md

@@ -405,7 +405,7 @@ To create a `PersistedAssemblyBuilder` instance, call its constructor and pass t
 
 :::code language="csharp" source="../snippets/dotnet-9/csharp/Reflection.cs" id="SaveAssembly":::
 
-The new <xref:System.Reflection.Emit.PersistedAssemblyBuilder> class includes PDB support. You can emit symbol info and use it to debug a generated assembly. The API has a similar shape to the .NET Framework implementation. For more information, see [Emit symbols and generate PDB](../../../fundamentals/runtime-libraries/system-reflection-emit-persistedassemblybuilder.md#emit-symbols-and-generate-pdb).
+The new <xref:System.Reflection.Emit.PersistedAssemblyBuilder> class includes PDB support. You can emit symbol info and use it to debug a generated assembly. The API has a similar shape to the .NET Framework implementation. For more information, see [Emit symbols and generate PDB](xref:System.Reflection.Emit.PersistedAssemblyBuilder#emit-symbols-and-generate-pdb).
 
 ### Type-name parsing
 

docs/csharp/language-reference/builtin-types/enum.md

@@ -63,7 +63,7 @@ If you want an enumeration type to represent a combination of choices, define en
 
 :::code language="csharp" source="snippets/shared/EnumType.cs" id="SnippetFlags":::
 
-For more information and examples, see the <xref:System.FlagsAttribute?displayProperty=nameWithType> API reference page and the [Non-exclusive members and the Flags attribute](../../../fundamentals/runtime-libraries/system-enum.md#non-exclusive-members-and-the-flags-attribute) section of the <xref:System.Enum?displayProperty=nameWithType> API reference page.
+For more information and examples, see <xref:System.FlagsAttribute?displayProperty=nameWithType> and [Non-exclusive members and the Flags attribute](xref:System.Enum#non-exclusive-members-and-the-flags-attribute).
 
 ## The System.Enum type and enum constraint
 

docs/csharp/toc.yml

@@ -412,10 +412,6 @@ items:
       href: advanced-topics/expression-trees/debugging-expression-trees-in-visual-studio.md
     - name: DebugView Syntax
       href: advanced-topics/expression-trees/debugview-syntax.md
-    - name: Supplemental API - Expression class add method
-      href: ../fundamentals/runtime-libraries/system-linq-expressions-expression-add.md
-    - name: Supplemental API - BinaryExpression class
-      href: ../fundamentals/runtime-libraries/system-linq-expressions-binaryexpression.md
   - name: Native interoperability
     items:
     - name: Overview

docs/framework/app-domains/toc.yml

@@ -48,9 +48,5 @@ items:
       href: shadow-copy-assemblies.md
     - name: "How to: Receive First-Chance Exception Notifications"
       href: how-to-receive-first-chance-exception-notifications.md
-  - name: Supplemental API remarks
-    items:
-    - name: AppDomain.UnhandledException event
-      href: ../../fundamentals/runtime-libraries/system-appdomain-unhandledexception.md
 - name: Run Intranet Applications in Full Trust
   href: running-intranet-applications-in-full-trust.md

docs/framework/network-programming/toc.yml

@@ -49,10 +49,6 @@ items:
       href: how-to-upload-files-with-ftp.md
     - name: List Directory Contents with FTP
       href: how-to-list-directory-contents-with-ftp.md
-    - name: Supplemental API remarks
-      items:
-      - name: FtpWebRequest.Proxy property
-        href: ../../fundamentals/runtime-libraries/system-net-ftpwebrequest-proxy.md
   - name: UDP
     href: using-udp-services.md
   - name: Security in Network Programming