ef6d40d osbuild: update schema and config documentation

Authored and Committed by thozza a year ago
    osbuild: update schema and config documentation
    
    The `koji-osbuild` Hub schema has been relaxed a bit in the latest
    release (v11). Adjust the schema in Pungi to reflect changes in
    `koji-osbuild`.
    
    For more information on the changes in `koji-osbuild`, see:
    https://github.com/osbuild/koji-osbuild/pull/108
    
    Signed-off-by: Tomáš Hozza <thozza@redhat.com>
    
        
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