[clang] [analyzer][docs] CSA release notes for clang-23 (PR #207433)

[Balázs Benics via cfe-commits]

steakhal wrote:

<img width="630" height="957" alt="image" src="https://github.com/user-attachments/assets/bd97b143-5c37-4782-bd33-951616e4c2e7" />


https://github.com/llvm/llvm-project/pull/207433