op-service/txmgr: fix go doc (#9331)

op-service/txmgr/queue.go

@@ -29,7 +29,7 @@ type Queue[T any] struct {
 
 // NewQueue creates a new transaction sending Queue, with the following parameters:
 //   - ctx: runtime context of the queue. If canceled, all ongoing send processes are canceled.
-//   - txMgt: transaction managre to use for transaction sending
+//   - txMgr: transaction manager to use for transaction sending
 //   - maxPending: max number of pending txs at once (0 == no limit)
 func NewQueue[T any](ctx context.Context, txMgr TxManager, maxPending uint64) *Queue[T] {
 	if maxPending > math.MaxInt {