Rendering of PR card description

[bamurtaugh]

I didn't expect to see <details><summary> written out in the PR card in the chat editor:

I realized I didn't see this in the secondary sidebar version of the PR card since the secondary sidebar had less space. But if I make it wider, I do see it there too.

Maybe it doesn't make sense to do anything here as it is the literal text from the description of the PR, but I figured I'd still open for discussion.