Search pages for some crates look broken

[jyn514]

https://docs.rs/tracing/0.1.18/tracing/?search=Span:

I suspect this is related to #930, but I haven't yet built this locally so I can look at it in an old version.

cc @RalfJung, thanks for the bug report on Zulip.

[jyn514]

Fixed by tokio-rs/tracing@a83e1bc, they haven't yet published a new version looks like.