Merge pull request 0xPolygon#2500 from 0xPolygon/Sharonbc01-patch-1

Update forkid-9-12.md

Author: mitchpolygon

docs/cdk/how-to/migrate/forkid-9-12.md

@@ -116,7 +116,8 @@ go run ./zk/debug_tools/datastream-host \
 ### Steps to Halt the Sequencer
 > 💡 Please note: For an isolated chain not attached to the Agglayer the chain admin can  perform operational step 4 on their chain’s rollupmanagercontract. 
 Polygon are not involved. Please check the [upgrade procedure for isolated networks](#contract-upgrade-procedure-for-isolated-networks).
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 1. Stop the sequencer.
 2. Reconfigure the node to enforce sequencer stops at a specific `batch_num`:
     - Get the current batch number from StateDB: