[dcl.fct] Move use of "parameter-type-list" to after its definition.

Split rules on function redeclarations out of rules for determining the
type of an individual function.

Author: zygoloid

source/declarators.tex

@@ -1426,12 +1426,7 @@
 \end{note}
 
 \pnum
-\indextext{overloading}%
 \indextext{type!function}%
-A single name can be used for several different functions in a single scope;
-this is function overloading (Clause~\ref{over}).
-All declarations for a function shall have equivalent return types,
-parameter-type-lists, and \grammarterm{requires-clause}{s}~(\ref{temp.over.link}).
 The type of a function is determined using the following rules.
 The type of each parameter (including function parameter packs) is
 determined from its own
@@ -1533,6 +1528,13 @@
 (\ref{dcl.type}).
 \end{example}
 
+\pnum
+\indextext{overloading}%
+A single name can be used for several different functions in a single scope;
+this is function overloading (Clause~\ref{over}).
+All declarations for a function shall have equivalent return types,
+parameter-type-lists, and \grammarterm{requires-clause}{s}~(\ref{temp.over.link}).
+
 \pnum
 \indextext{function return type|see{return type}}%
 \indextext{return type}%