Processed: fix typo in root-plugin-tree-treeviewer description

[Debian Bug Tracking System]

Processing commands for control at bugs.debian.org:

> tags 678805 + pending
Bug #678805 [root-plugin-tree-treeviewer] root-plugin-tree-treeviewer: typo in package description
Added tag(s) pending.
> thanks
Stopping processing here.

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678805: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=678805
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