add notes to each patch of our custom nextcloud image

Notes added to patches in our custom image, @arnauvp & @Potukuchi please review the notes for your patches to correctly fill subject and descriptions if i did it wrong as you better know the purposes of your patches.

if you do comments in this MR with the correct informations to fill in, I can update the notes accordingly

then we can publish this image publicly, as per the goal cited here : https://gitlab.e.foundation/e/infra/production-server/-/issues/306