Rustbook isn't stripping %'s

[Gankra]

https://doc.rust-lang.org/nightly/adv-book/

and

https://doc.rust-lang.org/nightly/book/

Show the title rendered twice, once as a header, once as % ...

[Gankra]

CC @azerupi I imagine this is fallout from #26216

[azerupi]

I don't think it's me, but I will check.
Have there been any commits for Rustdoc? That is the first thing I would check because the markdown is rendered by Rustdoc.

[azerupi]

It's not happening on my local version. So I guess a commit between mine and now broke Rustdoc.

[Gankra]

CC @oli-obk

[Gankra]

(just pinging random people who seem to have been in there recently...)

[azerupi]

Yeah no problem ;) I have tried to search the commit logs but I failed miserably. There are so many..