📝 Update source examples and docs from Python 3.9 to 3.10 (#14900)

docs_src/request_forms/tutorial001_an_py310.py

@@ -0,0 +1,10 @@
+from typing import Annotated
+
+from fastapi import FastAPI, Form
+
+app = FastAPI()
+
+
+@app.post("/login/")
+async def login(username: Annotated[str, Form()], password: Annotated[str, Form()]):
+    return {"username": username}

docs_src/request_forms/tutorial001_py310.py

@@ -0,0 +1,8 @@
+from fastapi import FastAPI, Form
+
+app = FastAPI()
+
+
+@app.post("/login/")
+async def login(username: str = Form(), password: str = Form()):
+    return {"username": username}