STL: Update comments citing old Working Papers

[StephanTLavavej]

In comments, we often cite and quote the current Working Paper. Over the years, its sections are renumbered and its wording changes due to features being added, library issues being resolved, and editorial issues being cleaned up. This is especially true after a recent overhaul of Constraints/Mandates/Requires/etc. elements.

We should clean up these old comments (and static_assert messages), which involves:

1. Citing the now-current Working Paper
2. Dropping the section number
   • See Restrict ADL for reference_wrapper and thread #3101 (comment) for rationale - section numbers are basically noise, they change too frequently, and searching for [stable.name] is fast
3. Checking that the stable name is still accurate (these rarely change, but it happens)
4. Updating the paragraph numbers if they have changed
5. Updating any quoted wording (making sure to clean out non-ASCII characters like long dashes)

[CaseyCarter]

All of our working draft citations will always be either out-of-date or at most a few months away from being out-of-date: the working drafts are a clock that never stops ticking. Given that we can't stay current without someone committing to updating every citation every time WG21 publishes a new working draft - which seems like effort that could be better invested elsewhere - I assume your intent is that we update all citations to working drafts older than X? Or perhaps that we update all citations to the final pre-publication working draft every time WG21 publishes a standard? (Once every three years seems more reasonable than once every four months.)

[StephanTLavavej]

Yeah, I think a global pass to update to the latest WP at the time, and then to each Standard, is a reasonable concrete goal.