Update builder specs to include deneb types

[bharath-123]

The builder specs still include capella definitions. I believe we can modify them to update the deneb specs. I want to understand if there is a reason behind not updating the builder.md file. If it is required to update, I m willing to take it up!

[ralexstokes]

I just don't think anyone has gotten around to it -- please feel free to open a PR!

[bharath-123]

Thanks for letting me know this @ralexstokes ! Will work on this