Add bug fixes description of overwrite changes for a file system storage pool

Add "Improvements" for commit id 'bb74a7ff' and '78be2e8b' which add
support for using the parent wwnn/wwpn or fabric_name rather than just
using the parent by scsi_hostX name.

Suggested-by: NJohn Ferlan <jferlan@redhat.com>

By default, pool-info will convert sizes to human friendly units.

This patch will introduce option [--bytes].
If specified, the raw sizes will be in the output.
Signed-off-by: NChen Hanxiao <chenhanxiao@gmail.com>

Signed-off-by: NJohn Ferlan <jferlan@redhat.com>

Currently, building the NEWS file involves using a XSLT stylesheet
to extract information from the same HTML file that's used on the
libvirt website.

The process works, but it's quite fiddly in that it requires the
source HTML to be formatted in a very precise way, and a single
missing newline can mess up the resulting plain text considerably.

Moreover, the XSLT stylesheet itself encodes a lot of the details
of converting to plain text in a way that's not necessarily easy
to understand, tweak or fix.

To improve the process, move all existing entries to a new XML
file that contains exactly the information we care about in a
simple structured format, and start generating both the HTML and
plain text versions of the release notes using XSLT stylesheets
that can now afford to be almost trivial.