app-emulation/virtualbox-guest-additions: Remove useless maintainer <…

…description/>

Remove useless/redundant maintainer <description/>. It does not benefit
bug wrangling, and only wastes developer's time on reading it. Few tips:

- assignee/CC is implied by ordering, there is no reason to repeat it,
- we know that maintainer is maintainer (la la la la la),
- most of adjectives for maintainer are of no value and/or are obvious.

app-emulation/virtualbox-guest-additions/metadata.xml

@@ -7,6 +7,5 @@
   </maintainer>
   <maintainer type="person">
     <email>[email protected]</email>
-    <description>Proxy maintainer. CC him on bugs</description>
   </maintainer>
 </pkgmetadata>