fixed typo, where usage of wrong interface was explained

BasePlugin/PluginConnectionInterface.hh

@@ -175,7 +175,7 @@ void ExamplePlugin::exampleFunction()
 }
 \endcode
 
-To use the ScriptInterface:
+To use the PluginConnectionInterface:
 <ul>
 <li> include PluginConnectionInterface.hh in your plugins header file
 <li> derive your plugin from the class PluginConnectionInterface