[DF][NFC] Add comment on the ownership of the output trees
[DF][NFC] Add comment on the ownership of the output trees

root-mirror/root,root-mirror/root,karies/root,karies/root,karies/root,olifre/root,root-mirror/root,root-mirror/root,olifre/root,root-mirror/root,karies/root,karies/root,karies/root,olifre/root,root-mirror/root,olifre/root,karies/root,olifre/root,olifre/root,olifre/root,olifre/root,root-mirror/root,olifre/root,karies/root,karies/root,olifre/root,root-mirror/root,olifre/root,root-mirror/root,karies/root,root-mirror/root,karies/root,root-mirror/root