Rollup merge of #140560 - Urgau:test_attr-module-level, r=GuillaumeGomez

Allow `#![doc(test(attr(..)))]` everywhere

This PR adds the ability to specify [`#![doc(test(attr(..)))]`](https://doc.rust-lang.org/nightly/rustdoc/write-documentation/the-doc-attribute.html#testattr) ~~at module level~~ everywhere in addition to allowing it at crate-root.

This is motivated by a recent PR #140323 (by ````@tgross35)```` where we have to duplicate 2 attributes to every single `f16` and `f128` doctests, by allowing `#![doc(test(attr(..)))]` at module level (and everywhere else) we can omit them entirely and just have (in both module):

```rust
#![doc(test(attr(feature(cfg_target_has_reliable_f16_f128))))]
#![doc(test(attr(expect(internal_features))))]
```

Those new attributes are appended to the one found at crate-root or at a previous module. Those "global" attributes are compatible with merged doctests (they already were before).

Given the small addition that this is, I'm proposing to insta-stabilize it, but I can feature-gate it if preferred.

Best reviewed commit by commit.

r? ````@GuillaumeGomez````

1 files changed, 0 insertions, 1 deletions

diff --git a/src/librustdoc/html/markdown.rs b/src/librustdoc/html/markdown.rs
index 68ba1245520..d3701784f9d 100644
--- a/src/librustdoc/html/markdown.rs
+++ b/src/librustdoc/html/markdown.rs
@@ -300,7 +300,6 @@ impl<'a, I: Iterator<Item = Event<'a>>> Iterator for CodeBlocks<'_, 'a, I> {
                 crate_name: krate.map(String::from).unwrap_or_default(),
                 no_crate_inject: false,
                 insert_indent_space: true,
-                attrs: vec![],
                 args_file: PathBuf::new(),
             };
             let mut builder = doctest::BuildDocTestBuilder::new(&test).edition(edition);