Rollup merge of #56793 - QuietMisdreavus:better-doctests, r=GuillaumeGomez

rustdoc: look for comments when scraping attributes/crates from doctests

Fixes https://github.com/rust-lang/rust/issues/56727

When scraping out crate-level attributes and `extern crate` statements, we wouldn't look for comments, so any presence of comments would shunt it and everything after it into "everything else". This could cause parsing issues when looking for `fn main` and `extern crate my_crate` later on, which would in turn cause rustdoc to incorrectly wrap a test with `fn main` when it already had one declared.

I took the opportunity to clean up the logic a little bit, but it would still benefit from a libsyntax-based loop like the `fn main` detection.

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