Fix warning

src/App.js

@@ -267,7 +267,6 @@ function EditDialog({ isOpen, setIsOpen, room }) {
   return <Dialog open={isOpen} onClose={() => { setIsOpen(false) }}>
     <DialogTitle>Salle n°{room}</DialogTitle>
     <DialogContent>
-      <DialogContentText>
       Noms :<br />
       {names.map(name => {
         return <Chip
@@ -307,8 +306,6 @@ function EditDialog({ isOpen, setIsOpen, room }) {
         fullWidth
       />
       <Button onClick={() => { addUser() }}>Ajouter</Button>
-      </DialogContentText>
-
     </DialogContent>
     <DialogActions>
       <Button onClick={() => { setIsOpen(false) }}>Fermer</Button>