Auto merge of #57882 - euclio:unused-doc-attributes, r=estebank

overhaul unused doc comments lint

This PR contains a number of improvements to the `unused_doc_comments` lint.

- Extends the span to cover the entire comment when using sugared doc comments.
- Triggers the lint for all unused doc comments on a node, instead of just the first one.
- Triggers the lint on macro expansions, and provides a help note explaining that doc comments must be expanded by the macro.
- Adds a label pointing at the node that cannot be documented.

Furthermore, this PR fixes any instances in rustc where a macro expansion was erroneously documented.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/libcore/num/mod.rs b/src/libcore/num/mod.rs
index 502e3de8c63..98b5fcd3ee4 100644
--- a/src/libcore/num/mod.rs
+++ b/src/libcore/num/mod.rs
@@ -4515,7 +4515,7 @@ macro_rules! rev {
     )*}
 }
 
-/// intra-sign conversions
+// intra-sign conversions
 try_from_upper_bounded!(u16, u8);
 try_from_upper_bounded!(u32, u16, u8);
 try_from_upper_bounded!(u64, u32, u16, u8);