Merge branch 'master' into hg-gh9168-cloudlink

Author: hguthrie

src/_data/toc/php-developer-guide.yml

@@ -140,6 +140,11 @@ pages:
 
         - label: Events and observers
           url: /extension-dev-guide/events-and-observers.html
+          children:
+          
+          - label: List of events
+            url: /extension-dev-guide/event-list.html
+            include_versions: ["2.4"]
 
         - label: Factories
           url: /extension-dev-guide/factories.html