Allow descriptions to start with an enumeration
Allow descriptions to start with an enumeration

This case was previously not handled at all, since the code handling the
<description/> tag was initially only meant for the regular
<description/> tag and not the one part of a <release/>. And for the
component-description-tag, starting with enumerations was disallowed.

For the <release/> case though, it's perfectly legit to start with an
enum, so we just change the code to allow that.

ximion/appstream,ximion/appstream,ximion/appstream,ximion/appstream