Update index.xml

Replacing "Report a security vulnerability" email, changing to a broadcom one and fixing link to support page

Author: pstack2021

site/index.xml

@@ -263,11 +263,11 @@ limitations under the License.
               <div class='container'>
                 <h1>Contact Us</h1>
                 <h2>Commercial inquiries</h2>
-                <p><a href='mailto:[email protected]'>VMware Sales</a> | <a href='https://tanzu.vmware.com/rabbitmq' target="_blank" rel="noopener noreferrer">VMware Support</a></p>
+                <p><a href='mailto:[email protected]'>VMware Sales</a> | <a href='https://tanzu.vmware.com/rabbitmq/oss' target="_blank" rel="noopener noreferrer">VMware Support</a></p>
                 <h2>Other inquiries</h2>
                 <p><a href="./contact.html">Contact us</a></p>
                 <h2>Report a security vulnerability</h2>
-                <p><a href="mailto:[email protected]">rabbitmq-core@groups.vmware.com</a></p>
+                <p><a href="mailto:tnz-rabbitmq-core.pdl@broadcom.com</a></p>
                 <h2>Social media</h2>
                 <p><a href='https://twitter.com/RabbitMQ' target="_blank" rel="noopener noreferrer">Twitter</a></p>
               </div>