asyncgenerator fix

docs/skills/nicegui/references/fastapi-uvicorn-startup.md

@@ -126,7 +126,7 @@ def get_settings() -> Settings:
 The argument-free [`functools.cache`](https://docs.python.org/3/library/functools.html#functools.cache) provider is appropriate here because both the project entry point and Uvicorn's zero-argument factory need process-lifetime access. Each reload or worker process gets its own settings instance. Do not add override arguments to `get_settings()`; inject a `Settings` instance directly into `create_app()` in tests or alternate composition roots. See the [Pydantic settings implementation guide](../../pydantic-settings/SKILL.md) for source precedence, independent settings boundaries, cache clearing, and runtime reload guidance.
 
 ```python title="src/my_app/main.py"
-from collections.abc import AsyncIterator
+from collections.abc import AsyncGeneratorr
 from contextlib import asynccontextmanager
 
 import uvicorn
@@ -137,7 +137,7 @@ from my_app.config import Settings, get_settings
 
 
 @asynccontextmanager
-async def lifespan(app: FastAPI) -> AsyncIterator[None]:
+async def lifespan(app: FastAPI) -> AsyncGenerator[None]:
     app.state.ready = True
     try:
         yield