They're currently trying to force this into pull requests in Bitbucket. Right now you can revert to the old-style pull requests with Markdown support, but that is going to go away once the new system is out of beta.
I really regret going with Atlassian here; I would have advised against it if I knew about this. I will definitely advise against it in the future.
I really regret going with Atlassian here; I would have advised against it if I knew about this. I will definitely advise against it in the future.