minor #18913 [Notifier] remove extra backtick character (hhamon)

This PR was merged into the 5.4 branch.

Discussion
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[Notifier] remove extra backtick character

Commits
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aa840ec [Notifier] remove extra backtick character

Author: javiereguiluz

notifier.rst

@@ -830,7 +830,7 @@ Using Events
     The ``MessageEvent``, ``FailedMessageEvent`` and ``SentMessageEvent`` were
     introduced in Symfony 5.4.
 
-The :class:`Symfony\\Component\\Notifier\\Transport`` class of the Notifier component
+The :class:`Symfony\\Component\\Notifier\\Transport` class of the Notifier component
 allows you to optionally hook into the lifecycle via events.
 
 The ``MessageEvent::class`` Event