Increase OAS description

Parce docstring of http handlers to increase OAS
Remove the not expected definitions key in the OAS

demo/view.py

@@ -10,25 +10,54 @@ from .model import Error, Pet
 
 class PetCollectionView(PydanticView):
     async def get(self, age: Optional[int] = None) -> r200[List[Pet]]:
+        """
+        List all pets
+
+        Status Codes:
+            200: Successful operation
+        """
         pets = self.request.app["model"].list_pets()
         return web.json_response(
             [pet.dict() for pet in pets if age is None or age == pet.age]
         )
 
     async def post(self, pet: Pet) -> r201[Pet]:
+        """
+        Add a new pet to the store
+
+        Status Codes:
+            201: Successful operation
+        """
         self.request.app["model"].add_pet(pet)
         return web.json_response(pet.dict())
 
 
 class PetItemView(PydanticView):
     async def get(self, id: int, /) -> Union[r200[Pet], r404[Error]]:
+        """
+        Find a pet by ID
+
+        Status Codes:
+            200: Successful operation
+            404: Pet not found
+        """
         pet = self.request.app["model"].find_pet(id)
         return web.json_response(pet.dict())
 
     async def put(self, id: int, /, pet: Pet) -> r200[Pet]:
+        """
+        Update an existing object
+
+        Status Codes:
+            200: Successful operation
+            404: Pet not found
+        """
         self.request.app["model"].update_pet(id, pet)
         return web.json_response(pet.dict())
 
     async def delete(self, id: int, /) -> r204:
+        """
+        Deletes a pet
+        """
         self.request.app["model"].remove_pet(id)
         return web.Response(status=204)