Housekeeping updates for .NET 8 GA

[gewarren]

Contributes to #34171

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📄 File	🔗 Preview link
api/index.md	.NET API browser
docs/architecture/grpc-for-wcf-developers/application-performance-management.md	Application Performance Management - gRPC for WCF Developers
docs/architecture/maui/unit-testing.md	Unit testing
docs/architecture/microservices/multi-container-microservice-net-applications/background-tasks-with-ihostedservice.md	Implement background tasks in microservices with IHostedService and the BackgroundService class
docs/architecture/porting-existing-aspnet-apps/deployment-scenarios.md	docs/architecture/porting-existing-aspnet-apps/deployment-scenarios
docs/core/compatibility/8.0.md	Breaking changes in .NET 8
docs/core/compatibility/aspnet-core/8.0/trimmode-full.md	TrimMode defaults to full for Web SDK projects
docs/core/compatibility/containers/8.0/multi-platform-tags.md	"Breaking change: Multi-platform container tags are Linux-only"
docs/core/compatibility/interop/8.0/safehandle-constructor.md	SafeHandle types must have public constructor
docs/core/compatibility/sdk/8.0/arch-option.md	docs/core/compatibility/sdk/8.0/arch-option
docs/core/compatibility/sdk/8.0/console-encoding.md	CLI console output uses UTF-8
docs/core/compatibility/sdk/8.0/version-requirements.md	"Breaking change: Version requirements for .NET 8 SDK"
docs/core/deploying/native-aot/index.md	Native AOT deployment
docs/core/deploying/trimming/trimming-options.md	docs/core/deploying/trimming/trimming-options
docs/core/extensions/queue-service.md	Create a Queue Service
docs/core/extensions/scoped-service.md	Use scoped services within a BackgroundService
docs/core/extensions/timer-service.md	Implement the IHostedService interface
docs/core/extensions/windows-service.md	docs/core/extensions/windows-service
docs/core/extensions/workers.md	Worker services in .NET
docs/core/porting/index.md	Port from .NET Framework to .NET 7
docs/core/tools/nuget-signed-package-verification.md	NuGet signed-package verification
docs/core/tutorials/cli-templates-create-template-package.md	Tutorial: Create a template package
docs/core/whats-new/dotnet-8.md	Copy everything else and build app.
docs/csharp/whats-new/csharp-12.md	docs/csharp/whats-new/csharp-12
docs/standard/frameworks.md	Target frameworks in SDK-style projects
docs/standard/native-interop/qualify-net-types-for-interoperation.md	Qualify .NET types for COM interoperation
docs/standard/net-standard.md	.NET Standard
docs/standard/serialization/system-text-json/converters-how-to.md	How to write custom converters for JSON serialization (marshalling) in .NET
docs/standard/serialization/system-text-json/customize-properties.md	docs/standard/serialization/system-text-json/customize-properties
docs/standard/serialization/system-text-json/preserve-references.md	How to preserve references and handle or ignore circular references in System.Text.Json

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[BillWagner]

This LGTM @gewarren

Once we resolve the warnings, let's

[gewarren]

Thanks for reviewing @BillWagner!