Published Parquet documentation missing arrow::async_reader

[kylebarron]

Describe the bug

As of today, the published docs at https://docs.rs/parquet/latest/parquet/ have a missing link to arrow::async_reader:

Checking out the repo locally, I can reproduce this with cargo doc --open, whereas with cargo doc --all-features --open I am able to see the async docs. I'm not sure exactly how docs are published, but presumably this process just needs to add --all-features?

To Reproduce

git clone https://github.com/apache/arrow-rs
git checkout 5374289f
cd parquet
cargo doc --open

[tustvold]

Likely related to #1349