Ré : don't boot: last line autofs4 module inserted

[Paul Dufresne <dufresnep@zoho.com>]

I did what the file says not to do: edit /boot/grub/grub.cfg file...
I added the line:
set root=/dev/mapper/main-myroot
in Warning... some lines exceed the width and are truncated:
### BEGIN /etc/grub.d/10_linux ###
function gfxmode {
        set gfxpayload="${1}"
}
set linux_gfx_mode=
export linux_gfx_mode
menuentry 'Debian GNU/Linux GNU/Linux' --class debian --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-simple-a9d23244-eea3-4>
        load_video
        insmod gzio
        if [ x$grub_platform = xxen ]; then insmod xzio; insmod lzopio; fi
        insmod part_gpt
        insmod part_gpt
        insmod part_gpt
        insmod lvm
        insmod ext2
        set root='lvmid/sMjw7e-rWxK-OkJd-RNtY-4599-Hz1q-3DtcNn/nbU01K-S2Qi-z01i-W3xO-s27B-UrZD-Fs8YLE'
        set root=/dev/mapper/main-myroot
        if [ x$feature_platform_search_hint = xy ]; then
          search --no-floppy --fs-uuid --set=root --hint='lvmid/sMjw7e-rWxK-OkJd-RNtY-4599-Hz1q-3DtcNn/nbU01K-S2Qi-z01i-W3xO-s27B-UrZD-Fs8YLE'  a9d2>
        else
          search --no-floppy --fs-uuid --set=root a9d23244-eea3-4239-b6d4-43b6e9339321
        fi
        echo    'Loading Linux 6.11.10-amd64 ...'
        linux   /boot/vmlinuz-6.11.10-amd64 root=/dev/mapper/main-myroot ro pcie_aspm=off nouveau.debug=info nouveau.noaccel=0 drm.debug=0 log_buf_l
        echo    'Loading initial ramdisk ...'
        initrd  /boot/initrd.img-6.11.10-amd64
}

So now it boot by default correctly...
until a new kernel will be installed or that I do update-grub.

Would like to know how to improve this.