[doc] typo: arch version in iso-definition.yaml on SUSE Multi Linux Manager quickstart page

[Gagrio]

Create a customized installation image with Edge Image Builder

`apiVersion: 1.0
image:
imageType: iso
arch: x64_64 ==> This should be x86_64
baseImage: slemicro.iso
outputImageName: eib-image.iso
operatingSystem:
users:

• username: root
  createHomeDir: true
  encryptedPassword: $6$aaBTHyqDRUMY1HAp$pmBY7.qLtoVlCGj32XR/Ogei4cngc3f4OX7fwBD/gw7HWyuNBOKYbBWnJ4pvrYwH2WUtJLKMbinVtBhMDHQIY0
  keymap: de
  systemd:
  enable:
  • cockpit.socket
    packages:
    noGPGCheck: true
    suma:
    host: ${fully qualified hostname of your SUSE Multi-Linux Manager Server}
    activationKey: 1-edge-x86_64`