Add postToolbarInit documentation and usage examples

doc/api/hooks_client-side.md

@@ -160,7 +160,19 @@ Things in context:
 1. ace - the ace object that is applied to this editor.
 2. pad - the pad object of the current pad.
 
-There doesn't appear to be any example available of this particular hook being used, but it gets fired after the editor is all set up.
+## postToolbarInit
+Called from: src/static/js/pad_editbar.js
+
+Things in context:
+
+1. ace - the ace object that is applied to this editor.
+2. toolbar - Editbar instance. See below for the Editbar documentation.  
+
+Can be used to register custom actions to the toolbar.
+
+Usage examples: 
+
+* [https://github.com/tiblu/ep_authorship_toggle]()
 
 ## postTimesliderInit
 Called from: src/static/js/timeslider.js

doc/api/hooks_server-side.md

@@ -104,6 +104,10 @@ Things in context:
 
 Here you can add custom toolbar items that will be available in the toolbar config in `settings.json`. For more about the toolbar controller see the API section.
 
+Usage examples: 
+
+* [https://github.com/tiblu/ep_authorship_toggle]()
+
 ## padCreate
 Called from: src/node/db/Pad.js