fix: bad link

Author: mikaelkael

notifier.rst

@@ -1002,7 +1002,7 @@ is dispatched. Listeners receive a
 .. _`OneSignal`: https://github.com/symfony/symfony/blob/{version}/src/Symfony/Component/Notifier/Bridge/OneSignal/README.md
 .. _`OrangeSms`: https://github.com/symfony/symfony/blob/{version}/src/Symfony/Component/Notifier/Bridge/OrangeSms/README.md
 .. _`OvhCloud`: https://github.com/symfony/symfony/blob/{version}/src/Symfony/Component/Notifier/Bridge/OvhCloud/README.md
-.. _`PageDuty`: https://github.com/symfony/symfony/blob/{version}/src/Symfony/Component/Notifier/Bridge/PageDuty/README.md
+.. _`PagerDuty`: https://github.com/symfony/symfony/blob/{version}/src/Symfony/Component/Notifier/Bridge/PagerDuty/README.md
 .. _`Plivo`: https://github.com/symfony/symfony/blob/{version}/src/Symfony/Component/Notifier/Bridge/Plivo/README.md
 .. _`Pushover`: https://github.com/symfony/symfony/blob/{version}/src/Symfony/Component/Notifier/Bridge/Pushover/README.md
 .. _`RingCentral`: https://github.com/symfony/symfony/blob/{version}/src/Symfony/Component/Notifier/Bridge/RingCentral/README.md