Fixes syntax

Author: AArdeev

doc/platform/app/app_roles.rst

@@ -74,16 +74,17 @@ defined by roles dependencies.
 The ``on_event`` callback provides 3 arguments, when it is called:
 
 - ``config``, which is the configuration of the role;
-- ``key``, which reflects the trigger event: 
+- ``key``, which reflects the trigger event:
     - ``config.apply`` if the callback was triggered by a configuration update; 
     - ``box.status`` if it was triggered by the ``box.status`` system event.
-- ``value``, which shows and logs the information about the instance status as in the trigger ``box.status`` system event. 
+- ``value``, which shows and logs the information about the instance status as in the trigger ``box.status`` system event.
     If the callback is triggered by a configuration update, the ``value`` shows the information of the most recent ``box.status`` system event.
 
 ..  NOTE::
 
     - All ``on_event`` callbacks with the ``config.apply`` key  are executed as a part of the configuration 
     process. Process statuses ``ready`` or ``check_warnings`` are reached only after all such ``on_event`` callbacks are done.
+
     - All ``on_event`` callbacks are executed inside of a ``pcall``. If an error is raised for a callback, it is logged with ``error`` level 
     and the series execution continues.