📝 Add Body Schema tutorial section

docs/tutorial/src/body-schema/tutorial001.py

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+from fastapi import Body, FastAPI
+from pydantic import BaseModel, Schema
+
+app = FastAPI()
+
+
+class Item(BaseModel):
+    name: str
+    description: str = Schema(None, title="The description of the item", max_length=300)
+    price: float = Schema(..., gt=0, description="The price must be greater than zero")
+    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

docs/tutorial/src/body-schema/tutorial002.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(
+        ...,
+        example={
+            "name": "Foo",
+            "description": "A very nice Item",
+            "price": 35.4,
+            "tax": 3.2,
+        },
+    )
+):
+    results = {"item_id": item_id, "item": item}
+    return results