Avoid ambiguity of placeholder on nested parameter

Signed-off-by: Mauro Russo <[email protected]>

source/declarations.tex

@@ -1779,7 +1779,8 @@
 \opt{\grammarterm{type-constraint}} \keyword{auto}.
 The placeholder type shall appear
 as one of the \grammarterm{decl-specifier}{s} in
-the \grammarterm{decl-specifier-seq} or
+the \grammarterm{decl-specifier-seq} or,
+in case of function pointer type,
 as one of the \grammarterm{type-specifier}{s} in
 a \grammarterm{trailing-return-type}
 that specifies the type that replaces such
@@ -1817,7 +1818,7 @@
 in an initializing declaration\iref{dcl.init} of a variable.
 The placeholder type shall appear as one of the
 \grammarterm{decl-specifier}{s} in the \grammarterm{decl-specifier-seq}
-or as one of the
+or, in case of function pointer type, as one of the
 \grammarterm{type-specifier}{s} in a \grammarterm{trailing-return-type}
 that specifies the type that replaces such a \grammarterm{decl-specifier};
 the \grammarterm{decl-specifier-seq}