Bug:
we need to convert V3 swagger to V2 and transform the examples, but examples part in request/responses/components are missing after converting V3 swagger to V2.
v3 swagger file: https://github.com/linkedin-developers/job-posting-development-tools/blob/master/OpenAPI-specification/job_posting_v2.yaml

To Reproduce
Steps to reproduce the current behavior:

1. run project Microsoft.OpenApi.Workbench
2. copy the content of v3 swagger file and paste it to "input content" area
3. choose JSON for Format, choose V2.0 for Version and click button "Convert"

Expected behavior
examples should display in V2 swagger.

Screenshots/Code Snippets
stack trace:

Microsoft.OpenApi.dll!Microsoft.OpenApi.Models.OpenApiDocument.SerializeAsV2(Microsoft.OpenApi.Writers.IOpenApiWriter writer) Line 143 C#
Microsoft.OpenApi.dll!Microsoft.OpenApi.Extensions.OpenApiSerializableExtensions.Serialize<Microsoft.OpenApi.Models.OpenApiDocument>(Microsoft.OpenApi.Models.OpenApiDocument element, Microsoft.OpenApi.Writers.IOpenApiWriter writer, Microsoft.OpenApi.OpenApiSpecVersion specVersion) Line 125 C#
Microsoft.OpenApi.dll!Microsoft.OpenApi.Extensions.OpenApiSerializableExtensions.Serialize<Microsoft.OpenApi.Models.OpenApiDocument>(Microsoft.OpenApi.Models.OpenApiDocument element, System.IO.Stream stream, Microsoft.OpenApi.OpenApiSpecVersion specVersion, Microsoft.OpenApi.OpenApiFormat format, Microsoft.OpenApi.Writers.OpenApiWriterSettings settings) Line 94 C#
Microsoft.OpenApi.Workbench.dll!Microsoft.OpenApi.Workbench.MainModel.WriteContents(Microsoft.OpenApi.Models.OpenApiDocument document) Line 312 C#
Microsoft.OpenApi.Workbench.dll!Microsoft.OpenApi.Workbench.MainModel.ParseDocument() Line 279 C#
Microsoft.OpenApi.Workbench.dll!Microsoft.OpenApi.Workbench.MainWindow.Button_Click(object sender, System.Windows.RoutedEventArgs e) Line 26 C#

screenshot: