Auto merge of #145970 - GuillaumeGomez:rollup-pr11qds, r=GuillaumeGomez

Rollup of 6 pull requests

Successful merges:

 - rust-lang/rust#142472 (Add new `doc(attribute = "...")` attribute)
 - rust-lang/rust#145368 (CFI: Make `lto` and `linker-plugin-lto` work the same for `compiler_builtins`)
 - rust-lang/rust#145853 (Improve error messages around invalid literals in attribute arguments)
 - rust-lang/rust#145920 (bootstrap: Explicitly mark the end of a failed test's captured output)
 - rust-lang/rust#145937 (add doc-hidden to exports in attribute prelude)
 - rust-lang/rust#145965 (Move exporting of profiler and sanitizer symbols to the LLVM backend)

r? `@ghost`
`@rustbot` modify labels: rollup

1 files changed, 18 insertions, 1 deletions

diff --git a/src/doc/rustdoc/src/unstable-features.md b/src/doc/rustdoc/src/unstable-features.md
index bb28e3abbf3..25c929a1dba 100644
--- a/src/doc/rustdoc/src/unstable-features.md
+++ b/src/doc/rustdoc/src/unstable-features.md
@@ -196,7 +196,7 @@ to enable.
 
 ### Document keywords
 
-This is for Rust compiler internal use only.
+This is for internal use in the std library.
 
 Rust keywords are documented in the standard library (look for `match` for example).
 
@@ -211,6 +211,23 @@ To do so, the `#[doc(keyword = "...")]` attribute is used. Example:
 mod empty_mod {}
 ```
 
+### Document builtin attributes
+
+This is for internal use in the std library.
+
+Rust builtin attributes are documented in the standard library (look for `repr` for example).
+
+To do so, the `#[doc(attribute = "...")]` attribute is used. Example:
+
+```rust
+#![feature(rustdoc_internals)]
+#![allow(internal_features)]
+
+/// Some documentation about the attribute.
+#[doc(attribute = "repr")]
+mod empty_mod {}
+```
+
 ### Use the Rust logo as the crate logo
 
 This is for official Rust project use only.