doc : add code example

Author: adiguba

documentation/docs/02-runes/05-$props.md

@@ -206,3 +206,17 @@ Adding types is recommended, as it ensures that people using your component can
 This rune, added in version 5.20.0, generates an ID that is unique to the current component instance. When hydrating a server-rendered a component, the value will be consistent between server and client.
 
 This is useful for linking elements via attributes like `for` and `aria-labelledby`.
+
+```svelte
+<script>
+	const uid = $props.id();
+</script>
+
+<form>
+	<label for="{uid}-firstname">First Name: </label>
+	<input id="{uid}-firstname" type="text" />
+
+	<label for="{uid}-lastname">Last Name: </label>
+	<input id="{uid}-lastname" type="text" />
+</form>
+```