channeldb+lnwallet: note that balance is after subtracting commit fee

It was incorrectly stated that the commitment balance was before
subctracting the commit fee, which led to some confusion.

channeldb/channel.go

@@ -320,10 +320,14 @@ type ChannelCommitment struct {
 
 	// LocalBalance is the current available settled balance within the
 	// channel directly spendable by us.
+	//
+	// NOTE: This is the balance *after* subtracting any commitment fee.
 	LocalBalance lnwire.MilliSatoshi
 
 	// RemoteBalance is the current available settled balance within the
 	// channel directly spendable by the remote node.
+	//
+	// NOTE: This is the balance *after* subtracting any commitment fee.
 	RemoteBalance lnwire.MilliSatoshi
 
 	// CommitFee is the amount calculated to be paid in fees for the

lnwallet/channel.go

@@ -502,7 +502,7 @@ type commitment struct {
 	// evaluating all the add/remove/settle log entries before the listed
 	// indexes.
 	//
-	// NOTE: This is the balance *before* subtracting any commitment fee.
+	// NOTE: This is the balance *after* subtracting any commitment fee.
 	ourBalance   lnwire.MilliSatoshi
 	theirBalance lnwire.MilliSatoshi