Rollup merge of #62595 - ngoldbaum:path-clarity-doc, r=Centril

Document that the crate keyword refers to the project root

:wave: this is my first rust contribution so I hope I'm doing everything correctly. Help very much appreciated if I'm not.

As far as I can tell this use of `crate` is only documented [in the edition guide for rust 2018](https://doc.rust-lang.org/edition-guide/rust-2018/module-system/path-clarity.html#the-crate-keyword-refers-to-the-current-crate). However it should probably be in the documentation for the `crate` keyword itself. This adds that documentation.

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