rustdoc: trait implementation is missing

[cynecx]

warp::filters::BoxedFilter implements warp::filter::FilterBase (crate-private trait therefore undocumented) and warp::filter::Filter through a conditional impl impl<T: FilterBase> Filter for T {}. However, rustdoc doesn't document that BoxedFilter implements the warp::Filter trait.

See here: https://docs.rs/warp/0.3.1/warp/filters/struct.BoxedFilter.html

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