fix example

Author: sgratzl

samples/vertical-tree.html

@@ -67,9 +67,9 @@
         11
       ],
       errorBars: {
-        'A': {plus: 25, minus: -10},
-        'C1.2': {plus: 14, minus: -15},
-        'C1': {plus: 34, minus: -5}
+        'A': {plus: 0.7, minus: -0.5},
+        'C1.2': {plus: 1.5, minus: -4},
+        'C1': {plus: 2, minus: -3.2}
       },
     }]
   };