fix: docs typo (#1202)

Author: tenphi

website/docs/chartjs-v3.mdx

@@ -34,7 +34,7 @@ If your app needs [Chart.js v3](https://www.chartjs.org/docs/3.9.1/), please use
   </TabItem>
 </Tabs>
 
-Also, please consider upgrading your app to [Chart.js v3](#upgrading-to-chartjs-v3).
+Also, please consider upgrading your app to [Chart.js v4](#upgrading-to-chartjs-v4).
 
 ## Upgrading to Chart.js v4