fix docstrings

Author: Roman

bittensor/core/async_subtensor.py

@@ -4018,6 +4018,8 @@ async def modify_liquidity(
             import bittensor as bt
 
             subtensor = bt.AsyncSubtensor(network="local")
+            await subtensor.initialize()
+
             my_wallet = bt.Wallet()
 
             # if `liquidity_delta` is negative