feat(localization): update demo email hint with new email

- Modify the demo email hint text to include an additional email address
- This change enhances the onboarding experience for new users by providing more examples

Author: fulleni

lib/authentication/view/request_code_page.dart

@@ -145,7 +145,7 @@ class _RequestCodeView extends StatelessWidget {
                                 top: AppSpacing.lg,
                               ),
                               child: Text(
-                                l10n.demoEmailHint('admin@example.com'),
+                                l10n.demoEmailHint('admin@example.com | publisher@example.com'),
                                 style: textTheme.bodyMedium?.copyWith(
                                   color: colorScheme.secondary,
                                   fontWeight: FontWeight.bold,