Dylan DPC 59e0af68ab
Rollup merge of #102954 - GuillaumeGomez:cfg-hide-attr-checks, r=Manishearth
Add missing checks for `doc(cfg_hide(...))`

Part of  #43781.

The `doc(cfg_hide(...))` attribute can only be used at the crate level and takes a list of attributes as argument.

r? ```@Manishearth```
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