update relsync config to mostly match upstream
    
    The updated file is based on
    https://github.com/openSUSE/doc-o-o/blob/main/rn-config/etc/releasenotes
    but still includes 42.3, 15.0 and 15.1.
    
    For >= 15.2 and Tumbleweed, package names get changed to include the
    version in package name ("-L15x" and "-TW").