[class.conv.ctor] turn last paragraph into a note

Author: eisenwave

source/classes.tex

@@ -2402,9 +2402,9 @@
 \end{note}
 
 \pnum
+\begin{note}
 A non-explicit copy/move constructor\iref{class.copy.ctor} is
 a converting constructor.
-\begin{note}
 An implicitly-declared copy/move constructor is not an explicit constructor;
 it can be called for implicit type conversions.
 \end{note}