d.vect.chart manual: screenshot added

git-svn-id: https://svn.osgeo.org/grass/grass/branches/releasebranch_7_0@64872 15284696-431f-4ddb-bdfa-cd5b030d7da7

display/d.vect.chart/d.vect.chart.html

@@ -28,12 +28,19 @@ plot if <b>chart_type</b> is <em>bar</em> (See Example 2).
 
 <h3>Example 1</h3>
 
-Pie-chart of winter precipitation (North Carolina sample dataset):
+Pie-chart of monthly winter precipitation (North Carolina sample dataset):
 
 <div class="code"><pre>
-d.vect.chart precip_30ynormals columns=nov,dec,jan,feb -l
+g.region vector=nc_state -p
+d.vect nc_state
+d.vect.chart precip_30ynormals chart_type=pie columns=nov,dec,jan,feb -l
 </pre></div>
 
+<center>
+<img src="d_vect_chart_pie_2d.png" alt="d.vect.chart 2D pie chart"><br>
+2D pie-chart of monthly winter precipitation in North Carolina
+</center>
+
 <h3>Example 2</h3>
 
 Bar-chart of different census map values:
@@ -57,8 +64,10 @@ d.vect.chart map=erode_index_ctrds chart_type=bar columns=cat \
 d.vect erode_index_ctrds icon=basic/circle fcol=black col=black size=5
 </pre></div>
 
+<center>
 <img src="d.vect.chart_example.jpg" alt="d.vect.chart example"><br>
 Bar charts of an erodibiliy index (spatial subset)
+</center>
 
 <h2>SEE ALSO</h2>