Updated network documentation to include circularImage shape.

docs/network.html

@@ -940,11 +940,11 @@ All options defined per-node override these global settings.
     <td>Define the shape for the node.
     Choose from
     <code>ellipse</code> (default), <code>circle</code>, <code>box</code>,
-    <code>database</code>, <code>image</code>, <code>label</code>, <code>dot</code>,
+    <code>database</code>, <code>image</code>, <code>circularImage</code>, <code>label</code>, <code>dot</code>,
     <code>star</code>, <code>triangle</code>, <code>triangleDown</code>, and <code>square</code>.
     <br><br>
 
-    In case of <code>image</code>, a property with name <code>image</code> must
+    In case of <code>image</code> and <code>circularImage</code>, a property with name <code>image</code> must
     be provided, containing image urls.
     <br><br>