Move changelog entry to the top [ci skip]

actionmailer/CHANGELOG.md

+*   Add `_mailer` suffix to mailers created via generator, following the same
+    naming convention used in controllers and jobs.
+
+    *Carlos Souza*
+
 *   Remove deprecate `*_path` helpers in email views.
 
     *Rafael Mendonça França*
@@ -29,11 +34,4 @@
 
     *Rafael Mendonça França*
 
-*   Add `_mailer` suffix to mailers created via generator, following the same
-naming convention used in controllers and jobs.
-
-    Closes #18074.
-
-    *Carlos Souza*
-
 Please check [4-2-stable](https://github.com/rails/rails/blob/4-2-stable/actionmailer/CHANGELOG.md) for previous changes.