Auto merge of #38161 - durka:rustdoc-crate-attrs, r=alexcrichton

rustdoc: fix doctests with non-feature crate attrs

Fixes #38129.

The book says that any top-level crate attributes at the beginning of a doctest are moved outside the generated `fn main`, but it was only checking for `#![feature`, not `#![`.

These attributes previously caused warnings but were then ignored, so in theory this could change the behavior of doctests in the wild.

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