[docs] Fix example image scale

examples/custom-datagrid-column/README.md

@@ -3,7 +3,7 @@
 <p class="description">A basic Toolpad app that shows how to add a code component inside a data grid.</p>
 
 <a target="_blank">
-  <img src="https://mui.com/static/toolpad/marketing/custom-datagrid-column.png" alt="Toolpad app showcasing custom data grid column" style="aspect-ratio: 687/331;" width="1180">
+  <img src="https://mui.com/static/toolpad/marketing/custom-datagrid-column.png" alt="Toolpad app showcasing custom data grid column" style="aspect-ratio: 687/331;" width="615">
 </a>
 
 Example showcasing Adding a code component as a data grid column. [The docs](https://mui.com/toolpad/building-ui/data-grid-component/#configuring-columns).