Update teaching.md

Author: xuedong

teaching.md

@@ -10,7 +10,7 @@ This page contains my teaching information and materials.
 
 <h3><B>2021/2022</B></h3>
 
-<p><a href="https://teopir.github.io/#teaching">Reinforcement Learning</a>, <a href="http://cmla.ens-paris-saclay.fr/version-anglaise/academics/mva-master-degree-227777.kjsp">Master in Mathématiques/Vision/Apprentissage</a>, ENS Paris Saclay, Instructor(s): Matteo Pirotta - <b>I am serving as teaching assistant</b>.
+<p><a href="https://teopir.github.io/#teaching">Reinforcement Learning</a>, <a href="http://cmla.ens-paris-saclay.fr/version-anglaise/academics/mva-master-degree-227777.kjsp">Master in Mathématiques/Vision/Apprentissage</a>, ENS Paris Saclay, Instructor(s): Matteo Pirotta - <b>I served as teaching assistant</b>.
 
 <h3><B>2019/2020</B></h3>