op-batcher: Improve explanation of MaxChannelDuration parameter

op-batcher/batcher/config.go

@@ -47,9 +47,12 @@ type CLIConfig struct {
 	// RollupRpc is the HTTP provider URL for the L2 rollup node.
 	RollupRpc string
 
-	// MaxChannelDuration is the maximum duration (in #L1-blocks) to keep the
-	// channel open. This allows control over how long a channel is kept open
-	// during times of low transaction volume.
+	// MaxChannelDuration is the maximum duration (in #L1-blocks) to keep a
+	// channel open. This allows to more eagerly send batcher transactions
+	// during times of low L2 transaction volume. Note that the effective
+	// L1-block distance between batcher transactions is then MaxChannelDuration
+	// + NumConfirmations because the batcher waits for NumConfirmations blocks
+	// after sending a batcher tx and only then starts a new channel.
 	//
 	// If 0, duration checks are disabled.
 	MaxChannelDuration uint64