Update mailer.rst

Co-Authored-By: Wouter J <[email protected]>

Author: weaverryan

mailer.rst

@@ -3,7 +3,7 @@ Sending Emails with Mailer
 
 .. versionadded:: 4.3
     The Mailer component was added in Symfony 4.3. The previous solution - Swiftmailer -
-    is still valid: :doc:`Swiftmailer</email>`.
+    is still valid: :doc:`Swift Mailer </email>`.
 
 Installation
 ------------