Fix out of date assertion

The lemma that was referred to has changed...

duality.tex

@@ -3231,8 +3231,8 @@ \section{Right adjoint of pushforward in examples}
 $a'(\mathcal{O}_{\Spec(k)}) = \mathcal{O}_E(-2)[1]$
 which is an invertible sheaf of degree $-2$ placed in
 cohomological degree $-1$, so different. In this example
-(4) is the only hypothesis of Lemma \ref{lemma-more-base-change}
-which is violated.
+the hypothesis of Tor indepence in Lemma \ref{lemma-more-base-change}
+is violated.
 \end{example}
 
 \begin{lemma}