message: update placeholder text resemble actual url
diff: @@ -135,7 +135,7 @@ export const OpenIdConnectSettings = () => {
  name="discoveryEndpoint"
  data-testid="discoveryEndpoint"
  id="kc-discovery-endpoint"
  - placeholder="https://hostname/.well-known/openid-configuration"
  + placeholder="https://hostname/auth/realms/master/.well-known/openid-configuration"
  value={discoveryUrl}
  onChange={setDiscoveryUrl}
  onBlur={() => setDiscovering(!discovering)}
  