Rollup merge of #141139 - jieyouxu:fix-rfl, r=Urgau

Fix Rust for Linux ping group label

Noticed in #140966 (comment). Seems like a broken label can cause the triagebot ping message to not be issued.

See rust-lang/triagebot#1992.

`@rustbot` label: +A-rust-for-linux

Author: fmease

src/doc/rustc-dev-guide/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

triagebot.toml

@@ -133,7 +133,7 @@ In case it's useful, here are some [instructions] for tackling these sorts of is
 
 [instructions]: https://rustc-dev-guide.rust-lang.org/notification-groups/rust-for-linux.html
 """
-label = "O-rfl"
+label = "A-rust-for-linux"
 
 [ping.wasm]
 alias = ["webassembly"]