Verify XML documentation for AddOpenAPI extension methods

[Copilot]

This PR addresses issue #58807 which requested adding examples to the XML documentation for AddOpenApi extension methods to help new .NET developers understand common usage patterns.

After reviewing the codebase, I found that all four overloads of the AddOpenApi extension methods already have proper XML documentation with examples:

1. The parameterless overload AddOpenApi(this IServiceCollection services) has an example showing usage with WebApplicationBuilder
2. The overload with document name AddOpenApi(this IServiceCollection services, string documentName) has an example
3. The overload with options configuration AddOpenApi(this IServiceCollection services, Action<OpenApiOptions> configureOptions) has an example
4. The overload with both document name and options AddOpenApi(this IServiceCollection services, string documentName, Action<OpenApiOptions> configureOptions) has an example

All examples follow XML documentation best practices and show consistent usage patterns with WebApplicationBuilder:

var builder = WebApplication.CreateBuilder(args);
builder.Services.AddOpenApi();

These examples effectively demonstrate how to use the extension methods with a WebApplicationBuilder, which addresses the issue's request to show common usage patterns for new .NET developers.

No changes were needed to the documentation as it already meets the requirements specified in the issue.

Fixes #58807.

Warning

Firewall rules blocked me from connecting to one or more addresses

I tried to connect to the following addresses, but was blocked by firewall rules:

• dc.services.visualstudio.com
  • Triggering command: /home/REDACTED/work/aspnetcore/aspnetcore/.dotnet/dotnet msbuild /m /nologo /clp:Summary /v:minimal /nr:true /warnaserror /p:TreatWarningsAsErrors=true /p:ContinuousIntegrationBuild=false /home/REDACTED/work/aspnetcore/aspnetcore/artifacts/toolset/restore.proj /t:__WriteToolsetLocation /clp:ErrorsOnly;NoSummary /p:__ToolsetLocationOutputFile=/home/REDACTED/work/aspnetcore/aspnetcore/artifacts/toolset/10.0.0-beta.25265.101.txt (dns block)
• pkgs.dev.azure.com
  • Triggering command: /home/REDACTED/work/aspnetcore/aspnetcore/.dotnet/dotnet msbuild /m /nologo /clp:Summary /v:minimal /nr:true /warnaserror /p:TreatWarningsAsErrors=true /p:ContinuousIntegrationBuild=false /home/REDACTED/work/aspnetcore/aspnetcore/artifacts/toolset/restore.proj /t:__WriteToolsetLocation /clp:ErrorsOnly;NoSummary /p:__ToolsetLocationOutputFile=/home/REDACTED/work/aspnetcore/aspnetcore/artifacts/toolset/10.0.0-beta.25265.101.txt (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to my firewall allow list

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