Don't use removed KS command as an example
    
    Following note:
    
    > * The command section which contains actual Kickstart commands and
    >   options as listed in Kickstart Syntax Reference. Note that some
    >   commands, such as install, are mandatory, but most commands are
    >   optional.
    
    mentions `install` command, which has been removed (according to
    *ksvalidator*).
    
    This commit is replacing it with `bootloader` command, which is still
    valid and required.