Add Hunspell binary .bdic information.

The license information in dsdt-policy.xml.in listed the GPL, but was unversioned. debian/copyright indicates it is actually GPLv2, so I updated dsdt-policy.xml.in to match.

I removed a comment regarding the "legalnotice" tag not printing because it appears to be obsolete.

The way the "ulink" was formatted in dsdt-policy.xml.in caused an unwanted double space in the dsdt-policy.txt output file, so I modified the format to remove the problem. Also, all of the "ulinks" I added also follow the correct format to remove redundant spaces. However, I did not audit the rest of the existing "ulinks" in the document.

The way "programlisting" was formatted caused an unwanted initial double line break. I fixed this problem by removing the surrounding "para" tags in the new section I added, but I did not make changes to the other existing "programlisting" tags in the document.

The text I added makes reference to two qwebengine_convert_dict bugs but does not reference https://bugreports.qt.io/browse/QTBUG-107599 because that bug can be worked around by modifying the upstream Hunspell Aragonese dictionary, which I intend to assist in doing.