Document the new Docker useSSL setting in launchSettings.json

There seems to be a new setting called `useSSL` in launchSettings.json but its undocumented. Does this make using Docker with HTTPS simpler? Does this page need updating?

- https://github.com/dotnet/aspnetcore/issues/38120

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#### Document Details

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* ID: 3e087007-7838-e0f9-d713-22182a5d9704
* Version Independent ID: 2f32c7c3-8667-0e88-495b-c0c888572964
* Content: [Hosting ASP.NET Core Images with Docker over HTTPS](https://docs.microsoft.com/en-us/aspnet/core/security/docker-https?view=aspnetcore-6.0)
* Content Source: [aspnetcore/security/docker-https.md](https://github.com/dotnet/AspNetCore.Docs/blob/main/aspnetcore/security/docker-https.md)
* Product: **aspnet-core**
* Technology: **aspnetcore-security**
* GitHub Login: @Rick-Anderson
* Microsoft Alias: **riande**