v.buffer manual: more example screenshots

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@59269 15284696-431f-4ddb-bdfa-cd5b030d7da7

vector/v.buffer/v.buffer.html

@@ -43,20 +43,39 @@ shown in black)
 <h3>Circles around input points</h3>
 
 <div class="code"><pre>
-v.buffer input=hospitals output=hospitals_circled type=point distance=1000 
+v.buffer input=hospitals output=hospitals_circled type=point distance=2000 
 </pre></div>
 
+<center>
+<img src="v_buffer_points.png" border="1"><br>
+Buffer of 2000m around the "hospitals" points (map subset, original points
+shown in black, new area centroids in red)
+</center>
+
 <h3>Circles around input points with attribute transfer</h3>
 
 <div class="code"><pre>
 v.buffer input=hospitals output=hospitals_circled type=point distance=1000 -t
+
 # display buffer around hospital with category 36,
 # this buffer is composed of several areas:
 d.vect map=hospitals_circled type=area layer=1 cats=36
 # extract this buffer, dissolving boundaries
-v.extract in=hospitals_circled out=hospital_36_circled layer=1 cats=36 -d
+v.extract in=hospitals_circled output=hospital_36_circled layer=1 cats=36 -d
+</pre></div>
+
+<h3>Buffer around input areas</h3>
+
+<div class="code"><pre>
+v.buffer input=lakes output=lakes_buffer type=area distance=100
 </pre></div>
 
+<center>
+<img src="v_buffer_areas.png" border="1"><br>
+Buffer of 100m around the "lakes" polygons (map subset, original areas
+shown in black)
+</center>
+
 <h2>REFERENCE</h2>
 
 <ul>