fix: css in examples directory. (#8977)

* Update App.svelte

CSS Fixes in span element.

* Add space

---------

Co-authored-by: Ben McCann <322311+benmccann@users.noreply.github.com>

documentation/examples/06-lifecycle/02-update/App.svelte

@@ -89,6 +89,7 @@
 	}
 
 	span {
+		color: black;
 		padding: 0.5em 1em;
 		display: inline-block;
 	}