Update advanced/encoding.md

Author: vladminsky

advanced/encoding.md

@@ -91,20 +91,4 @@ and define color brewer like below
         }
     }
 }
-```
-
-##Size
-Size encoding currently applies to point element only. Point diameter depends on the min and max value in a *size* dimension.
-
-```javascript
-var spec = {
-    unit:[{
-        type: 'ELEMENT.POINT',
-        x: 'effort',
-        y: 'cycleTime',
-        size: 'bugsCount'
-    }]
-};
-```
-
-[Example](http://jsfiddle.net/taucharts/awn8rz8w/)
+```