d.mon: manual page cosmetics

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@48421 15284696-431f-4ddb-bdfa-cd5b030d7da7

display/d.mon/d.mon.html

@@ -90,7 +90,8 @@ From this moment all data will be rendered into
 file <tt>output.pdf</tt>. To switch back to interactive wxGUI monitor
 
 
-<div class="code"><pre> d.mon select=wx0
+<div class="code"><pre>
+d.mon select=wx0
 </pre></div>
 
 To close this monitor