[libc++][NFC] More consistency fixes to the CSV entries

- Update note for P0156 which was reverted in Kona, to avoid unusual status.
- Add the LWG issue number for an old C++14 NB comment.
- Fix broken link for LWG2118
- Capitalize paper numbers and links consistently
- Remove weird status '* *' which was likely added by mistake

NOKEYCHECK=True
GitOrigin-RevId: 39c7dc7207e76e72da21cf4fedda21b5311bf62d
6 files changed