Add link to multiple tracker docs in changelog. https://github.com/piwik/piwik/issues/10174

CHANGELOG.md

@@ -7,7 +7,7 @@ The Product Changelog at **[piwik.org/changelog](http://piwik.org/changelog)** l
 ## Piwik 2.16.2
 
 ### New APIs
- * Multiple JavaScript trackers can now be created easily via `_paq.push(['addTracker', piwikUrl, piwikSiteId])`. All tracking requests will be then sent to all added Piwik trackers.
+ * Multiple JavaScript trackers can now be created easily via `_paq.push(['addTracker', piwikUrl, piwikSiteId])`. All tracking requests will be then sent to all added Piwik trackers. [Learn more.](http://developer.piwik.org/guides/tracking-javascript-guide#multiple-piwik-trackers)
  * It is possible to get an asynchronously created tracker instance (`addTracker`) via the method `Piwik.getAsyncTracker(optionalPiwikUrl, optionalPiwikSiteId)`. This allows you to get the tracker instance and to send different tracking requests to this Piwik instance and to configure it differently than other tracker instances.
 
 ### Internal change