✏️ Fix typos in docs (#11926)

docs_src/dataclasses/tutorial002.py

@@ -21,6 +21,6 @@ async def read_next_item():
     return {
         "name": "Island In The Moon",
         "price": 12.99,
-        "description": "A place to be be playin' and havin' fun",
+        "description": "A place to be playin' and havin' fun",
         "tags": ["breater"],
     }