Update index.html

note about asterix added.

Author: amrapalijz

index.html

@@ -219,6 +219,7 @@ <h2>Audience</h2>
 
     <section name="apimd">
       <h2>API Metadata Elements</h2>
+	    <p>Note: Asterix (*) against the metadata element indicates that the property is not in the openAPI specification.</p>
       <script type="text/javascript"> if (window.showTocToggle) { var tocShowText = "show"; var tocHideText = "hide"; showTocToggle(); } </script>
 		<div class="buttonpanel">
 			<form action="#"><p>