[inplace.vector.overview] Replace residual use of 'trivial type'

Author: jensmaurer

source/containers.tex

@@ -9549,7 +9549,8 @@
 \pnum
 Let \tcode{IV} denote a specialization of \tcode{inplace_vector<T, N>}.
 If \tcode{N} is zero, then
-\tcode{IV} is both trivial and empty.
+\tcode{IV} is trivially copyable and empty, and
+\tcode{std::is_trivially_default_constructible_v<IV>} is \tcode{true}.
 Otherwise:
 \begin{itemize}
 \item