docs: update EventManager-API.md

Author: abose

docs/generatedApiDocs/utils/EventManager-API.md

@@ -18,14 +18,14 @@ const EventDispatcher = brackets.getModule("utils/EventDispatcher"),
 EventManager = brackets.getModule("utils/EventManager");
 EventDispatcher.makeEventDispatcher(exports);
 
-EventManager.registerEventHandler("drawImageHandler", exports);
+EventManager.registerEventHandler("drawImage-Handler", exports);
 ```
 
 Once the event handler is registered, we can trigger events on the named handler anywhere in phoenix
 (inside or outside the extension) by using:
 
 ```js
-EventManager.triggerEvent("drawImageHandler", "someEventName", "param1", "param2", ...);
+EventManager.triggerEvent("drawImage-Handler", "someEventName", "param1", "param2", ...);
 ```
 
 ## registerEventHandler
@@ -49,7 +49,10 @@ To register a close dialogue event handler in an extension:
 const EventDispatcher = brackets.getModule("utils/EventDispatcher"),
 EventDispatcher.makeEventDispatcher(exports);
 
-EventManager.registerEventHandler("closeDialogueHandler", exports);
+// Note: for event handler names, please change the <extensionName> to your extension name
+// to prevent collisions. EventHandlers starting with `ph-` and `br-` are reserved as system handlers
+// and not available for use in extensions.
+EventManager.registerEventHandler("<extensionName>-closeDialogueHandler", exports);
 // Once the event handler is registered, see triggerEvent API on how to raise events
 ```