remove old docs

Author: kmurphypolygon

docs/cdk/how-to/migrate/7-8-local-test.md

@@ -95,4 +95,4 @@ Follow the steps to verify all batches for upgrading from fork 7 to 8.
     3. `SequenceSender.WaitPeriodSendSequence = "60s”` # restore previous value
     4. `SequenceSender.LastBatchVirtualizationTimeMaxWaitPeriod = “600s”` # restore previous value
 
-7. Restart sequencer, sequence-sender and aggregator.
+7. Restart sequencer, sequence-sender, and aggregator.