[libcxx-commits] [libcxx] [libcxx] reorganises the hardening documentation (PR #73159)

[Konstantin Varlamov via libcxx-commits]

var-const wrote:

@cjdb Thank you for working on this! Sorry I'm slow with the review (a combination of holidays and being OOO sick). LGTM modulo one comment (feel free to ping me on Discord if you'd like to discuss it further).

https://github.com/llvm/llvm-project/pull/73159