Add `auto_cfg` and `no_auto_cfg` attributes#102599

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GuillaumeGomez wants to merge 9 commits into

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GuillaumeGomez:doc_auto_cfg

Commits on Oct 10, 2022

Add doc(auto_cfg) and doc(no_auto_cfg) attributes
GuillaumeGomez
committed
Add missing `#![doc(auto_cfg)]` attribute in rustdoc tests
GuillaumeGomez
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Add rustdoc-ui test for `doc(auto_cfg)` and `doc(no_auto_cfg)` attributes
GuillaumeGomez
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Add check for usage of both `doc(auto_cfg)` and `doc(no_auto_cfg)` at the same time
GuillaumeGomez
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Add tests for duplicated usage of `doc(auto_cfg)` and `doc(no_auto_cfg)`
GuillaumeGomez
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Update documentation for `doc_auto_cfg` feature
GuillaumeGomez
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Emit a warning if `auto_cfg` is not used when `doc_auto_cfg` feature is used
GuillaumeGomez
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Add rustdoc-ui tests for warning emitted when `auto_cfg` is not used with `doc_auto_cfg` feature
GuillaumeGomez
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Improve error messages
GuillaumeGomez
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