format "The to prop" in async-animations.mdx

docs/app/routes/docs/advanced/async-animations.mdx

@@ -55,7 +55,7 @@ export default function MyComponent() {
 }
 ```
 
-## The to prop
+## The `to` prop
 
 If you've read any of the `component` pages, you'll know we accept a `to` prop, it's typically used as an object,
 but alternatively, you can also use an array (chaining the animations) or a function (writing an animation script).