Describe retrieval of StopwatchEvent

Author: jochenvdv

components/stopwatch.rst

@@ -31,6 +31,8 @@ microtime by yourself. Instead, use the simple
     // ... some code goes here
     $event = $stopwatch->stop('eventName');
 
+The :class:`Symfony\\Component\\Stopwatch\StopwatchEvent` object can be retrieved from :method:`Symfony\\Component\\Stopwatch\\Stopwatch::start`, :method:`Symfony\\Component\\Stopwatch\\Stopwatch::stop`, :method:`Symfony\\Component\\Stopwatch\\Stopwatch::lap` and :method:`Symfony\\Component\\Stopwatch\\Stopwatch::getEvent`
+
 You can also provide a category name to an event::
 
     $stopwatch->start('eventName', 'categoryName');