update async file

Author: blink1073

pymongo/asynchronous/cursor.py

@@ -1299,7 +1299,7 @@ async def to_list(self, length: Optional[int] = None) -> list[_DocumentType]:
 
           >>> await cursor.to_list()
 
-        Or, so read at most n items from the cursor::
+        Or, to read at most n items from the cursor::
 
           >>> await cursor.to_list(n)