[incorrect info] P2440 partially supported on clang 21

[jojva]

Which proposal(s) is / are affected?

P2440

Which compiler / toolchain is affected?

The site states that it is not supported by clang, but it is actually partially supported by clang-21 (only std::ranges::iota). See llvm/llvm-project#68494.

[cdervis]

Thank you for reporting this, updated the site.