[dcl.attr.nodiscard] Make the constructor case better parallel the

function case by duplicating the implied "through a reachable
declaration" wording.

Author: zygoloid

source/declarations.tex

@@ -9026,7 +9026,8 @@
 \item
   an explicit type
   conversion~(\ref{expr.static.cast}, \ref{expr.cast}, \ref{expr.type.conv})
-  that constructs an object through a constructor declared \tcode{nodiscard}, or
+  that constructs an object through
+  a constructor declared \tcode{nodiscard} in a reachable declaration, or
   that initializes an object of a nodiscard type.
 \end{itemize}