chore: corrected the writing of Service Worker

Author: mfranzke

demo/index.html

@@ -215,7 +215,7 @@ <h2>dynamic images &amp; iframes</h2>
 		<script type="module" src="index.js"></script>
 		<script>
 			if ("serviceWorker" in navigator) {
-				// Differentiate in between the ServiceWorker scripts for the different browser capabilities / support
+				// Differentiate in between the Service Worker scripts for the different browser capabilities / support
 				navigator.serviceWorker.register(
 					"../loading-attribute-polyfill.sw.js?loading-images=" +
 						("loading" in HTMLImageElement.prototype) +