[unord.map.cnstr] Fix misapplication of edit for LWG2230.

Reported by Alisdair Meredith.
[basic.stc.auto] Fix apparent contradiction: the `static` implied by
`thread_local` is not explicit, so this wording could be read as
claiming that `thread_local` local variables have automatic storage
duration, contradicting wording in several other parts of the standard
and the design intent.