Fix typo in etale-cohomology

Thanks to Yuzhou Gu
http://stacks.math.columbia.edu/tag/03Q2#comment-2052

etale-cohomology.tex

@@ -4686,7 +4686,7 @@ \section{Inverse image}
 $u: \mathcal{C}_2 \to \mathcal{C}_1$ be a functor satisfying:
 \begin{enumerate}
 \item if $\{V_i \to V\}$ is a covering of $\mathcal{C}_2$, then
-$\{u(V_i) \to V_i\}$ is a covering of $\mathcal{C}_1$ (we
+$\{u(V_i) \to u(V)\}$ is a covering of $\mathcal{C}_1$ (we
 say that $u$ is {\it continuous}), and
 \item $u$ commutes with finite limits (i.e., $u$ is left exact, i.e.,
 $u$ preserves fibre products and final objects).