r.neighbors manual: HTML cosmetics

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@61246 15284696-431f-4ddb-bdfa-cd5b030d7da7

raster/r.neighbors/r.neighbors.html

@@ -208,13 +208,13 @@ This corresponds to the following 3x3 matrix:
 
 To calculate an annulus shaped neighborhood the contents of weight.txt file 
 may be e.g. for size=5:
-<pre>
+<div class="code"><pre>
  0 1 1 1 0
  1 0 0 0 1
  1 0 0 0 1
  1 0 0 0 1
  0 1 1 1 0
-</pre>
+</pre></div>
 
 The way that weights are used depends upon the specific aggregate
 (<b>method</b>) being used.