The file "/etc/ImageMagick-6/policy.xml" is not a valid xml file because
line 76 is missing "-->" to close the comment on the same line.
As a result, it creates a comment containing both this line and the next
one, which makes the comment include "--", which is forbidden in xml.
Reference: https://www.w3.org/TR/REC-xml/#sec-comments
Currently, this prevent automatic tools from parsing this file, since it
doesn't get validated as a valid xml file.