Update index.rst

Author: hellomedia

src/Chartjs/doc/index.rst

@@ -191,15 +191,15 @@ custom Stimulus controller:
                     ticks: {
                         callback: function (value, index, values) {
                             /* ... */
-                        }
-                    }
-                }
+                        },
+                    },
+                },
             };
             // Add to an existing Y axis config
             event.detail.config.options.scales.y.ticks = {
                 callback: function (value, index, values) {
                     /* ... */
-                }
+                },
             };
         }