Document loadSettings hook.

doc/api/hooks_server-side.md

@@ -6,6 +6,15 @@ All hooks registered to these events are called with two arguments:
 1. name - the name of the hook being called
 2. context - an object with some relevant information about the context of the call
 
+## loadSettings
+Called from: src/node/server.js
+
+Things in context:
+
+1. settings - the settings object
+
+Use this hook to receive the global settings in your plugin.
+
 ## pluginUninstall
 Called from: src/static/js/pluginfw/installer.js