minor #20739 [Notifier] Error: Undefined Variable $texter (cadot-eu)

This PR was merged into the 7.2 branch.

Discussion
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[Notifier] Error: Undefined Variable $texter

The variable $texter is not defined inside the method, so PHP will throw an "Undefined variable" error.

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Commits
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16a9235 Error: Undefined Variable $texter

Author: javiereguiluz

notifier.rst

@@ -759,7 +759,7 @@ Now you can send notifications to your desktop as follows::
                 sprintf('%s is a new subscriber', $user->getFullName())
             );
 
-            $texter->send($message);
+            $this->texter->send($message);
         }
     }