[2025-11 LWG Motion 19] P3923R0 Additional NB comment resolutions for Kona 2025

[jensmaurer]

https://wiki.edg.com/pub/Wg21kona2025/StrawPolls/p3923r0.html

[tkoeppe]

For these omnibus papers, please make one commit per individual fix. The title of that commit could be something like "P3923R0: Re NB US 160-260", say.

The (single) pull request should then also include all the "Fixes: ..." lines for the NB comment issues.

Please beware that this paper depends on Motion 6 (#8465), and the pull request should perhaps be made into a branch containing those changes. (I will rebase that properly at merge time.)

[timsong-cpp]

I'm pretty sure the dependency is superficial (it's "I don't want to quote - or duplicate - text that I removed in another issue") and the two papers can be applied independently