Auto merge of #141216 - fmease:rollup-pa5mvx3, r=fmease

Rollup of 8 pull requests

Successful merges:

 - #140113 (Add per page TOC in the `rustc` book)
 - #140511 (Stabilize `#![feature(non_null_from_ref)]`)
 - #140924 (Make some `f32`/`f64` tests also run in const-context)
 - #140966 (Remove #![feature(let_chains)] from library and src/librustdoc)
 - #141045 ([win][arm64] Remove 'Arm64 Hazard' undocumented MSVC option and instead disable problematic test)
 - #141071 (Enable [behind-upstream] triagebot option for rust-lang/rust)
 - #141132 (Use `crate::` prefix for root macro suggestions)
 - #141139 (Fix Rust for Linux ping group label)

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

Author: bors

src/notification-groups/rust-for-linux.md

@@ -1,9 +1,9 @@
 # Rust for Linux notification group
 
-**Github Label:** [O-rfl] <br>
+**Github Label:** [A-rust-for-linux] <br>
 **Ping command:** `@rustbot ping rfl`
 
-[O-rfl]: https://github.com/rust-lang/rust/labels/O-rfl
+[A-rust-for-linux]: https://github.com/rust-lang/rust/labels/A-rust-for-linux
 
 This list will be used to notify [Rust for Linux (RfL)][rfl] maintainers
 when the compiler or the standard library changes in a way that would