[class.copy.assign] Remove note obsoleted by CWG2586

Author: jensmaurer

source/classes.tex

@@ -1675,10 +1675,6 @@
 copy assignment operators, and, if selected, will be used to assign an object.
 \end{footnote}
 \begin{note}
-An overloaded assignment operator must be declared to have only one parameter;
-see~\ref{over.ass}.
-\end{note}
-\begin{note}
 More than one form of copy assignment operator can be declared for a class.
 \end{note}
 \begin{note}