Removed an extra empty line.

git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/trunk@2394 3789f03b-4d11-0410-bbf8-ca57d06f2519

unix/x0vncserver/x0vncserver.man

 discovered with a longer delay.  That's because high priority values make the
 server send video with highest rate possible, without spending time on
 polling and video detection.
-
 .TP
 .B CompareFB
 Perform pixel comparison on framebuffer to reduce unnecessary updates.