[except.handle] Remove confusing comparison to variadic functions

The analogy that the ellipsis in an exception handler was similar to an
ellipsis in a function declaration may have made sense at one time, but
the comparison with a syntax using a macro based API calling 'va_arg'
to access its contents --- something that is not possible for an
exception handler --- seems more confusing than helpful today.

Author: AlisdairM

source/exceptions.tex

@@ -604,10 +604,7 @@
 \tcode{...}
 in a handler's
 \grammarterm{exception-declaration}
-functions similarly to
-\tcode{...}
-in a function parameter declaration;
-it specifies a match for any exception.
+specifies a match for any exception.
 If present, a
 \tcode{...}
 handler shall be the last handler for its try block.