clarify attribute change example

Sascha Schulz

2024-02-05 904d9655997b1cb46bb8044843465c8045092af8

clarify attribute change example

 index.html

@@ -3608,6 +3608,13 @@
                    <section>
                        <h3>Auf Attribute reagieren</h3>
                        <pre>
                            <code class=html data-trim data-line-numbers>
                                <script type="text/template">
                                    <hello-world my-attribute="a"></hello-world>
                                </script>
                            </code>
                        </pre>
                        <pre>
                            <code class="js" data-trim data-line-numbers="2|8-10">
                                <script type="text/template">
                                    class HelloWorldComponent extends HTMLElement {