r.kappa manual: simple NC example added

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@60118 15284696-431f-4ddb-bdfa-cd5b030d7da7

raster/r.kappa/r.kappa.html

@@ -48,6 +48,14 @@ information for each and every category.
 
 <H2>EXAMPLE</H2>
 
+Example for North Carolina sample dataset:
+
+<div class="code"><pre>
+g.region rast=landclass96 -p
+r.kappa -w classification=landuse96_28m reference=landclass96
+</pre></div>
+<p>
+
 Verification of classified LANDSAT scene against training areas:
 
 <div class="code"><pre>