minor #5850 Fixed typo (tobiassjosten)

This PR was submitted for the 2.8 branch but it was merged into the 2.3 branch instead (closes #5850).

Discussion
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Fixed typo

Comparing events to subscribers doesn't make much sense, so I figured it must be a typo.

Commits
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6e220ef Fixed typo

Author: xabbuh

cookbook/event_dispatcher/event_listener.rst

@@ -248,8 +248,10 @@ or a "sub request"::
 Certain things, like checking information on the *real* request, may not need to
 be done on the sub-request listeners.
 
-Events or Subscribers
----------------------
+.. _events-or-subscribers:
+
+Listeners or Subscribers
+------------------------
 
 Listeners and subscribers can be used in the same application indistinctly. The
 decision to use either of them is usually a matter of personal taste. However,