[depr.func.adaptor.typedefs] Clarify that reference_wrapper does not define argument_type for non-nullary member function pointer types.

Author: Eelis

source/future.tex

@@ -1543,8 +1543,7 @@
 only if the type \tcode{T} is any of the following:
 \begin{itemize}
 \item a function type or a pointer to function type taking one argument of type \tcode{T1}
-% FIXME: Should this be R T0::f() ?
-\item a pointer to member function \tcode{R T0::f} \cv{} (where \cv{} represents the member function's cv-qualifiers); the type \tcode{T1} is \cv{}~\tcode{T0*}
+\item a pointer to member function \tcode{R T0::f()} \cv{} (where \cv{} represents the member function's cv-qualifiers); the type \tcode{T1} is \cv{}~\tcode{T0*}
 \item a class type where the \grammarterm{qualified-id} \tcode{T::argument_type}
 is valid and denotes a type~(\ref{temp.deduct});
 the type \tcode{T1} is \tcode{T::argument_type}.