[basic.stc] Fix introductory sentence on dynamic storage duration to

match later more-normative rule: it applies to objects, not storage.

Fixes NB JP 3 (C++17 CD).

Author: zygoloid

source/basic.tex

@@ -2819,8 +2819,8 @@
 Static, thread, and automatic storage durations are associated with objects
 introduced by declarations~(\ref{basic.def}) and implicitly created by
 the implementation~(\ref{class.temporary}). The dynamic storage duration
-is associated with objects created with \tcode{operator}
-\tcode{new}~(\ref{expr.new}).
+is associated with objects created by a
+\grammarterm{new-expression}~(\ref{expr.new}).
 
 \pnum
 The storage duration categories apply to references as well.