[class.copy.elision] improve reference and replace informal term

Author: Eisenwave

source/classes.tex

@@ -6227,8 +6227,8 @@
 corresponding parameter if the meaning of the program will be unchanged except for
 the execution of a constructor and destructor for the parameter copy object
 
-\item when the \grammarterm{exception-declaration} of an
-exception handler\iref{except.pre} declares an object of the same
+\item when the \grammarterm{exception-declaration} of a
+\grammarterm{handler}\iref{except.handle} declares an object of the same
 type (except for cv-qualification) as the exception
 object\iref{except.throw}, the copy operation can be omitted by treating
 the \grammarterm{exception-declaration} as an alias for the exception