[SOLVED] - kernel panic please help

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I edited /boot/config to include dtparam=audio=on as per https://archlinuxarm.org/platforms/armv8/broadcom/raspberry-pi-3. It wasn't in there originally so I edited the file and added it myself. When I rebooted I got a kernel panic. it's stuck on:
$this->bbcode_second_pass_code('', '[ 4.744382] ---[ end Kernel panic - not syncing: Attempted to kill the idle task!')

I don't know what to do. How can I fix it? Please help.

UPDATE

Nevermind, I managed to fix it Luckily I had another distro on another sdcard, booted into it then used an sd card reader to mount the arch sdcard and edited the /boot/config.txt file to remove the dtparam=audio=on