Add commentary to emphasize that new/const can be implicit, and new/const C<T>() is still an error when C<T> is super-bounded

Author: eernstg

specification/dartLangSpec.tex

@@ -7803,7 +7803,9 @@ \subsection{Super-Bounded Types}
   \commentary{%
   This includes the case where the actual type arguments have been provided
   by type inference, which is assumed to have taken place already
-  (\ref{typeInference}).%
+  (\ref{typeInference}).
+  It also includes the case where \NEW{} or \CONST{} is added implicitly
+  (\ref{unqualifiedInvocation}, \ref{functionExpressionInvocation}).%
   }
 \item $T$ occurs in the \synt{constructorDesignation} of
   a redirecting factory constructor header