doc: enhance derive package code comments (#12437)

op-node/rollup/derive/doc.go

@@ -2,7 +2,7 @@
 // and turn it into L2 blocks and results. Certain L2 data is also able to
 // turned back into L1 data.
 //
-// The flow is data is as follows
+// The data flow is as follows:
 // receipts, batches -> eth.PayloadAttributes, by parsing the L1 data and deriving L2 inputs
 // l2.PayloadAttributes -> l2.ExecutionPayload, by running the EVM (using an Execution Engine)
 // L2 block -> Corresponding L1 block info, by parsing the first deposited transaction