CWG2648 Correspondence of surrogate call function and conversion function

Also fixes NB CA 063 (C++23 CD).

Author: burblebee

source/overloading.tex

@@ -3418,11 +3418,12 @@
 where the \grammarterm{postfix-expression} is of class type,
 the operator function
 is selected by overload resolution\iref{over.call.object}.
-If a surrogate call function for a conversion function
-named \keyword{operator} \grammarterm{conversion-type-id} is selected,
+If a surrogate call function is selected,
+let $e$ be the result of invoking the corresponding conversion operator function on the \grammarterm{postfix-expression};
+
 the expression is interpreted as
 \begin{ncsimplebnf}
-postfix-expression \terminal{.} \keyword{operator} conversion-type-id \terminal{(}\terminal{)} \terminal{(} \opt{expression-list} \terminal{)}
+$e$ \terminal{(} \opt{expression-list} \terminal{)}
 \end{ncsimplebnf}
 Otherwise, the expression is interpreted as
 \begin{ncsimplebnf}