[libcxx-commits] [libcxx] [libc++] Fix documentation for setting hardening ABI macros (PR #121946)

[Vasil Dimov via libcxx-commits]

https://github.com/vasild approved this pull request.

LGTM 180dd2a27fa30f4f2cb7ffc2c26d3483195f1f85

Following these instructions resolved the issue in https://github.com/bitcoin/bitcoin/pull/31612

nit: while here maybe drop the extra trailing \` a bunch of lines below in:
```
``_LIBCPP_ABI_BOUNDED_UNIQUE_PTR```
```

https://github.com/llvm/llvm-project/pull/121946