Typo in etale

Thanks to Dario Weissmann
https://stacks.math.columbia.edu/tag/039P#comment-3256

etale.tex

@@ -1336,7 +1336,7 @@ \section{\'Etale and smooth morphisms}
 Let $\varphi : X \to Y$ be a morphism of schemes.
 Let $x \in X$.
 If $\varphi$ is smooth at $x$, then
-there exist and integer $n \geq 0$ and affine opens
+there exist an integer $n \geq 0$ and affine opens
 $V \subset Y$ and $U \subset X$ with $x \in U$ and $\varphi(U) \subset V$
 such that there exists a commutative diagram
 $$