message: Add note to test tokens
diff: @@ -58,8 +58,13 @@ export default class IdentityAuthClient {
  _checkToken(token) {
  // TODO: Test current API token via `/account` endpoint
  +
  // At the moment, Sydent doesn't implement `/account`, so we can't use
  // that yet. We could try a lookup for a null address perhaps...?
  + // Sydent doesn't currently expire tokens, but we should still be testing
  + // them in any case.
  + // See also https://github.com/vector-im/riot-web/issues/10452.
  +
  // In any case, we should ensure the token in `localStorage` is cleared
  // appropriately. We already clear storage on sign out, but we'll need
  // additional clearing when changing ISes in settings as part of future
  