breakage guidance

Author: BoxyUwU

content/Rust-1.89.0.md

@@ -136,6 +136,14 @@ pub fn cool_simd_code(/* .. */) -> /* ... */ {
 
 Doctests will now be tested when running `cargo test --doc --target other_target`, this may result in some amount of breakage due to would-be-failing doctests now being tested.
 
+Failing tests can be disabled by annotating the doctest with `ignore-<target>`:
+```rust
+/// ```ignore-x86_64
+/// panic!("something")
+/// ```
+/// pub fn my_function() { }
+``` 
+
 ### Platform Support
 
 - [Add new Tier-3 targets `loongarch32-unknown-none` and `loongarch32-unknown-none-softfloat`](https://github.com/rust-lang/rust/pull/142053)