swagger show summary

proj.csproj

<PropertyGroup>
  <GenerateDocumentationFile>true</GenerateDocumentationFile>
  <NoWarn>$(NoWarn);1591</NoWarn>
</PropertyGroup>

Startup.cs

services.AddSwaggerGen(c =>
            {
                c.SwaggerDoc("v1", new OpenApiInfo { Title = "TodoList API", Version = "v1" });
                c.IncludeXmlComments(Path.Combine(AppContext.BaseDirectory, 
                    $"{Assembly.GetExecutingAssembly().GetName().Name}.xml"));
            });