Update index.html

typo

Author: amrapalijz

index.html

@@ -1181,7 +1181,7 @@ <h3>Response Header</h3>
   		<li>Cardinality: 0..n</li>
   		<li>Datatype: object</li>
 	  </ul>  
-	<p>OpenAPI element: <font size="3" face="verdana" color=green>response.headers.hearders.header</font></p>
+	<p>OpenAPI element: <font size="3" face="verdana" color=green>response.headers.headers.header</font></p>
       <div class="example">
        <p>
        <pre>