Merge pull request #33260 from bogdanvlviv/fix-docs-of-assert_no_emails

Fix docs of `assert_no_emails` [ci skip]

actionmailer/lib/action_mailer/test_helper.rb

@@ -60,7 +60,7 @@ def assert_emails(number, &block)
     #
     # Note: This assertion is simply a shortcut for:
     #
-    #   assert_emails 0
+    #   assert_emails 0, &block
     def assert_no_emails(&block)
       assert_emails 0, &block
     end