feat: update welcome onboarding message

tests/test_release_help.py

@@ -320,7 +320,7 @@ class OnboardingTests(unittest.IsolatedAsyncioTestCase):
         from help_message import WELCOME_RICH_HTML, rich_to_plain
 
         text = rich_to_plain(WELCOME_RICH_HTML)
-        for term in ("Привет", "Напиши пост", "скриншот", "Главное меню"):
+        for term in ("Привет", "Обучение", "Генерацию", "черновика"):
             self.assertIn(term, text)
         self.assertNotIn("Лобби", text)
         self.assertNotIn("/lobby", text)