[over.match.oper] Add a note for conversions on synthesized candidates.

Author: jensmaurer

source/overloading.tex

@@ -1076,6 +1076,11 @@
 \end{itemize}
 where in each case \tcode{operator<=>} candidates
 are not considered for the recursive lookup of operator \tcode{@}.
+\begin{note}
+A candidate synthesized from a member candidate has its implicit
+object parameter as the second parameter, thus implicit conversions
+are considered for the first, but not for the second, parameter.
+\end{note}
 
 \pnum
 The argument list contains all of the