Fix warning

src/App.js

@@ -267,48 +267,45 @@ 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
-            label={name}
-            key={name}
-            variant="outlined"
-            onDelete={() => { removeName(name) }}
-          />
-        })}
-
-        <TextField
-          value={newPlaceName}
-          onChange={(event) => { setNewPlaceName(event.target.value) }}
-          label="Nom de la salle"
-          margin="dense"
-          fullWidth
+      Noms :<br />
+      {names.map(name => {
+        return <Chip
+          label={name}
+          key={name}
+          variant="outlined"
+          onDelete={() => { removeName(name) }}
         />
-        <Button onClick={() => { addName() }}>Ajouter</Button>
+      })}
 
-        <Divider />
+      <TextField
+        value={newPlaceName}
+        onChange={(event) => { setNewPlaceName(event.target.value) }}
+        label="Nom de la salle"
+        margin="dense"
+        fullWidth
+      />
+      <Button onClick={() => { addName() }}>Ajouter</Button>
 
-        Utilisateurs :<br />
-        {users.map(name => {
-          return <Chip
-            label={name}
-            key={name}
-            variant="outlined"
-            onDelete={() => { removeUser(name) }}
-          />
-        })}
+      <Divider />
 
-        <TextField
-          value={newUserName}
-          onChange={(event) => { setNewUserName(event.target.value) }}
-          label="Nom de l'utilisateur"
-          margin="dense"
-          fullWidth
+      Utilisateurs :<br />
+      {users.map(name => {
+        return <Chip
+          label={name}
+          key={name}
+          variant="outlined"
+          onDelete={() => { removeUser(name) }}
         />
-        <Button onClick={() => { addUser() }}>Ajouter</Button>
-      </DialogContentText>
+      })}
 
+      <TextField
+        value={newUserName}
+        onChange={(event) => { setNewUserName(event.target.value) }}
+        label="Nom de l'utilisateur"
+        margin="dense"
+        fullWidth
+      />
+      <Button onClick={() => { addUser() }}>Ajouter</Button>
     </DialogContent>
     <DialogActions>
       <Button onClick={() => { setIsOpen(false) }}>Fermer</Button>