📝 Add body multiple parameters docs

docs/tutorial/src/body-multiple-params/tutorial001.py

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+from fastapi import FastAPI, Path
+from pydantic import BaseModel
+
+app = FastAPI()
+
+
+class Item(BaseModel):
+    name: str
+    description: str = None
+    price: float
+    tax: float = None
+
+
+@app.put("/items/{item_id}")
+async def update_item(
+    *,
+    item_id: int = Path(..., title="The ID of the item to get", ge=0, le=1000),
+    q: str,
+    item: Item = None,
+):
+    results = {"item_id": item_id}
+    if q:
+        results.update({"q": q})
+    if item:
+        results.update({"item": item})
+    return results

docs/tutorial/src/body-multiple-params/tutorial002.py

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+from fastapi import FastAPI
+from pydantic import BaseModel
+
+app = FastAPI()
+
+
+class Item(BaseModel):
+    name: str
+    description: str = None
+    price: float
+    tax: float = None
+
+
+class User(BaseModel):
+    username: str
+    full_name: str = None
+
+
+@app.put("/items/{item_id}")
+async def update_item(*, item_id: int, item: Item, user: User):
+    results = {"item_id": item_id, "item": item, "user": user}
+    return results

docs/tutorial/src/body-multiple-params/tutorial003.py

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+from fastapi import Body, FastAPI
+from pydantic import BaseModel
+
+app = FastAPI()
+
+
+class Item(BaseModel):
+    name: str
+    description: str = None
+    price: float
+    tax: float = None
+
+
+class User(BaseModel):
+    username: str
+    full_name: str = None
+
+
+@app.put("/items/{item_id}")
+async def update_item(
+    *, item_id: int, item: Item, user: User, importance: int = Body(...)
+):
+    results = {"item_id": item_id, "item": item, "user": user, "importance": importance}
+    return results

docs/tutorial/src/body-multiple-params/tutorial004.py

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+from fastapi import Body, FastAPI
+from pydantic import BaseModel
+
+app = FastAPI()
+
+
+class Item(BaseModel):
+    name: str
+    description: str = None
+    price: float
+    tax: float = None
+
+
+class User(BaseModel):
+    username: str
+    full_name: str = None
+
+
+@app.put("/items/{item_id}")
+async def update_item(
+    *,
+    item_id: int,
+    item: Item,
+    user: User,
+    importance: int = Body(..., gt=0),
+    q: str = None
+):
+    results = {"item_id": item_id, "item": item, "user": user, "importance": importance}
+    if q:
+        results.update({"q": q})
+    return results

docs/tutorial/src/body-multiple-params/tutorial005.py

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+from fastapi import Body, FastAPI
+from pydantic import BaseModel
+
+app = FastAPI()
+
+
+class Item(BaseModel):
+    name: str
+    description: str = None
+    price: float
+    tax: float = None
+
+
+@app.put("/items/{item_id}")
+async def update_item(*, item_id: int, item: Item = Body(..., embed=True)):
+    results = {"item_id": item_id, "item": item}
+    return results