Update index.rst

`event.detail.config.options.scales = { ... }` does not just format Y axis, it overrides all existing configuration for both axes.

Author: hellomedia

src/Chartjs/doc/index.rst

@@ -185,14 +185,8 @@ custom Stimulus controller:
             console.log(event.detail.config);
 
             // For instance you can format Y axis
-            event.detail.config.options.scales = {
-                y: {
-                    ticks: {
-                        callback: function (value, index, values) {
-                            /* ... */
-                        },
-                    },
-                },
+            event.detail.config.options.scales.y.ticks.callback = function (value, index, values) {
+                /* ... */
             };
         }