- Fixes paper number P1862 -> P1868. (The title was correct.)
- Marks P1868 as in progress.
- Marks P1892 as in progress.
- Marks LWG-3327 as nothing to do, since the wording change doesn't
impact the code. (Also updated on the general C++20 status page.)
A status page for libc++'s Format library. The page is inspired by
@zoecarver's Ranges status page.
Differential Revision: https://reviews.llvm.org/D101085