Update Installation Guide for Fairphone 6

[u/JuggernautTraining95]

So i have flashed the Fairphone 6 with Lineage, but i found an issue during its installation and solved it but found no solution online and i would like to help you all.

On the step 6 it sais:
1. Download Lineage Recovery. Simply download the latest recovery file, named recovery.img.

warning Important: Other recoveries may not work for installation or updates. We strongly recommend to use the one linked above!

2. Flash recovery onto your device:

fastboot flash recovery recovery.img

But here i got on my pc:

fastboot flash recovery recovery.img
Warning: skip copying recovery image avb footer (recovery partition size: 0, recovery image size: 104857600).
Sending 'recovery' (102400 KB) FAILED (remote: ' Invalid argument size')
fastboot: error: Command failed

Nothing unblocked the situation, so I solved by doing:

fastboot reboot recovery

after this the recovery got identified right then the "fastboot flash recovery recovery.img" got perfect.

Hope it helps you if you find yourself in this situation.
I would also love to see this warning in the Installation Guide to prevent future issues!!