Updated Container Guidelines

Hi Adam & co., I think the container guidelines should include a section about the Layered Images used as a base for other Layered Builds. I've created an updated draft that also fixes label names to use the lower-case convention: https://fedoraproject.org/wiki/User:Hhorak/Draft/Container:Review_Process Is it possible to merge the changes? Or is there any process for it? Honza