minor #12848 Update error_handler.rst (atailouloute)

This PR was submitted for the 5.0 branch but it was merged into the 4.4 branch instead (closes #12848).

Discussion
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Update error_handler.rst

There is no more FatalErrorException in SF 5.0

Commits
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2fcb72f Update error_handler.rst

Author: javiereguiluz

components/error_handler.rst

@@ -49,7 +49,7 @@ Turning PHP Errors into Exceptions
 The :class:`Symfony\\Component\\ErrorHandler\\ErrorHandler` class catches PHP
 errors and uncaught PHP exceptions and turns them into PHP's
 :phpclass:`ErrorException` objects, except for fatal PHP errors, which are
-turned into Symfony's :class:`Symfony\\Component\\ErrorHandler\\Exception\\FatalErrorException`
+turned into Symfony's :class:`Symfony\\Component\\ErrorHandler\\Error\\FatalError`
 objects.
 
 If the application uses the FrameworkBundle, this error handler is enabled by