minor #13877 Update error_pages.rst (atailouloute)

This PR was merged into the 5.0 branch.

Discussion
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Update error_pages.rst

`setException` is replaced by `setThrowable` in SF5+

Commits
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b5a2a89 Update error_pages.rst

Author: javiereguiluz

controller/error_pages.rst

@@ -317,7 +317,7 @@ error pages.
 
 .. note::
 
-    If your listener calls ``setResponse()`` on the
+    If your listener calls ``setThrowable()`` on the
     :class:`Symfony\\Component\\HttpKernel\\Event\\ExceptionEvent`,
     event, propagation will be stopped and the response will be sent to
     the client.