Rollup merge of #45767 - QuietMisdreavus:who-docs-the-doc-tool, r=frewsxcv

rustdoc book: talk about #![doc(test(no_crate_inject))] and #![doc(test(attr(...)))]

While investigating https://github.com/rust-lang/rust/issues/45750 i noticed that `#![doc(test(attr(...)))]` wasn't documented at all. Since this is useful for making your examples follow the same coding guidelines as your code, i wanted to add it to the Rustdoc Book. I also added `#![doc(test(no_crate_inject))]` since it's used in the same place and might be useful for macro-heavy crates. I added mentions for these to "The `doc` attribute" as well as "Documentation tests" since it's useful information in both places.

Technically the step reordering in the second commit is gated on https://github.com/rust-lang/rust/pull/45764, since before that lands attributes from the doctest come before the ones from `#![doc(test(attr(...)))]`.

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