Keep the commented ParallelDownloads in pacman.conf

When the /etc/pacman.conf is edited for the docker with this content:

# We cannot check disk space from within a chroot environment
#CheckSpace

The parameter #ParallelDownloads = 5 is fully removed from the file, but that config line is in the pacman.conf at the root of this project.

Could we recheck that replace? I didn't find the code who is making this replace yet.