Replace class-name by type-specifier as in grammar

chapters/functions.tex

@@ -490,8 +490,8 @@ \subsection{Functional Input Arguments to Functions}\doublelabel{functional-inpu
 
 A functional input argument to a function is an argument of function
 type. The declared type of such an input formal parameter in a function
-can be the class-name of a partial function that has no replaceable
-elements. It cannot be the class-name of a record or enumeration
+can be the type-specifier of a partial function that has no replaceable
+elements. It cannot be the type-specifier of a record or enumeration
 (i.e., record constructor functions and enumeration type
 conversions are not allowed in this context). Such an input formal
 parameter of function type can also have an optional functional default