`doc(hidden)` reexports

[flodiebold]

futures and futures-core reexport a bunch of things with #[doc(hidden)]. rust-analyzer will in the future hide doc(hidden) items from completions and autoimport (it already does so if the item itself is hidden, it's just not handling hidden reexports yet), so if these reexport are actually intended to be used, they probably shouldn't be hidden; they might instead need doc(no_inline) or just no annotation.

CC rust-lang/rust-analyzer#7718 (see the discussion at the end) and rust-lang/rust-analyzer#9197.

[taiki-e]

Thanks for reporting this! Seems doc(no_inline) is better for trait re-exports. (It was quite some time ago that we marked it as doc(hidden) and probably none of us knew about doc(no_inline) at that point.)

[nipunn1313]

@rustbot claim

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