Made greybox a section for better visibility (#8029)

rules/reply-done-and-delete-the-email/rule.md

@@ -26,13 +26,11 @@ If someone asks you to perform a task by email, don't reply "OK, I will do that"
 
 Read the "[Definition of Done](/definition-of-done)" for more information about the steps that need to be finished before replying to a done email.
 
-::: greybox
-**Only say "Done" when the work is completed.**
+### Only say "Done" when the work is completed
 
 * [Ensure your changes are live](/dones-do-your-dones-include-a-url/#ensure-your-changes-are-live) when sending a "Done"
 * If you have added the email to your backlog or to-do list, then say "<mark>Added to backlog – URL is XXX</mark>". You should still reply "Done" when you complete the task.
 * For tasks that will take time to be completely done (E.g. Producing a long video), you may send a "work in progress" email. This way you avoid giving the perception that no action was in relation to the task. You should still reply "Done" when you complete the task.
-:::
 
 ### Alternatives to classic "Done" emails