Review request for JMC-6622: Correcting landing page information

[Marcus Hirt]

Hi all,

Please review this fix to correct some information in the update site
landing pages.

Jira:   https://bugs.openjdk.java.net/browse/JMC-6622
Webrev: http://cr.openjdk.java.net/~hirt/JMC-6622/webrev.0/

Kind regards,
Marcus