Clarify chrome.events as a namespace of common types.

chrome/common/extensions/docs/templates/intros/events.html

Index: chrome/common/extensions/docs/templates/intros/events.html
diff --git a/chrome/common/extensions/docs/templates/intros/events.html b/chrome/common/extensions/docs/templates/intros/events.html
index 2451f621dbd5c2197ac6b0802037a6e437bfdd6c..3cb44b8126fa6f715ac7d992e29e12a1d28012fd 100644
--- a/chrome/common/extensions/docs/templates/intros/events.html
+++ b/chrome/common/extensions/docs/templates/intros/events.html
@@ -29,6 +29,16 @@ an $ref:alarms.Alarm object
 that has details about the elapsed alarm.
 </p>
 
+Example APIs using Events:
+$ref:alarms,
+{{?is_apps}}
+$ref:app.runtime,
+$ref:app.window,
+{{/is_apps}}
+$ref:i18n,
+$ref:identity,
+$ref:runtime.
+Most <a href="api_index.html">chrome APIs</a> do.
 
 {{^is_apps}}
 <div class="doc-family extensions">