[basic.lval] turn reference paragraph into note

Author: Eisenwave

source/expressions.tex

@@ -272,9 +272,11 @@
 applied to convert the expression to an xvalue.
 
 \pnum
+\begin{note}
 The discussion of reference initialization in~\ref{dcl.init.ref} and of
 temporaries in~\ref{class.temporary} indicates the behavior of lvalues
 and rvalues in other significant contexts.
+\end{note}
 
 \pnum
 Unless otherwise indicated\iref{dcl.type.decltype},