minor symfony#8241 Update event_dispatcher.rst (afurculita)

This PR was submitted for the 3.3 branch but it was merged into the 3.2 branch instead (closes symfony#8241).

Discussion
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Update event_dispatcher.rst

The TraceableDispatcher is not part of the HttpKernel component anymore

Commits
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83e349c Update event_dispatcher.rst

components/event_dispatcher.rst

@@ -500,8 +500,7 @@ with some other dispatchers:
 
 * :doc:`/components/event_dispatcher/container_aware_dispatcher`
 * :doc:`/components/event_dispatcher/immutable_dispatcher`
-* :doc:`/components/event_dispatcher/traceable_dispatcher` (provided by the
-  :doc:`HttpKernel component </components/http_kernel>`)
+* :doc:`/components/event_dispatcher/traceable_dispatcher`
 
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