doc: show required features on items on docs.rs #156
Merged
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Example output:![example output with the changes from the MR, showing the `async` and `select` modules needing features of the same name to be available](https://private-user-images.githubusercontent.com/7951708/376672987-f7d19f5c-675c-428f-9ad2-0725c264772f.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.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.9k2KgYfdETgXb7wECH66DQkVjuGwO_1ElzU4D_Apn74)