DOCS-903 c/$box/$polygon

Author: epc

source/reference/operator/within.txt

@@ -40,7 +40,7 @@ $within
 
      .. code-block:: javascript
 
-        db.collection.find( { location: { $within: { $box: [[100,120], [100,100], [120,100], [240,200]] } } } );
+        db.collection.find( { location: { $within: { $polygon: [[100,120], [100,100], [120,100], [240,200]] } } } );
 
      The last point of a polygon is implicitly connected to the first
      point.