RB_ASKNAME is no longer instructions to the boot loader to request a prompt for which kernel to boot. Instead, it asks for what the root file system to use. RB_INITNAME is unused, and never has been in FreeBSD as far as I can tell. Remove it from the documentation and fix comment. RB_SELFTEST and RB_MINIROOT likewise (though they were completely undocumented). These last three constants can likely just be deleted as nothing references them (even to set useless bits). RB_ASKNAME doesn't actually survive reboot, however, so needs to be communicated to the bootloader via other means. If the bootloader sets it, though, it will be honored.
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