Removed redundant update method for adding key-value pair in dict.

It is simpler to do it directly rather than via update method. This also eliminates the overhead of constructing another dictionary and calling a method, so should slightly improve performance. [ Read at Sourcery]

docs_src/body_multiple_params/tutorial001.py

@@ -22,7 +22,7 @@ async def update_item(
 ):
     results = {"item_id": item_id}
     if q:
-        results.update({"q": q})
+        results.["q"]= q
     if item:
-        results.update({"item": item})
+        results["item"]=item
     return results