asset: fix doc comments

Author: ffranr

asset/asset.go

@@ -93,10 +93,10 @@ const (
 type EncodeType uint8
 
 const (
-	// Encode normal is the normal encoding type for an asset.
+	// EncodeNormal normal is the normal encoding type for an asset.
 	EncodeNormal EncodeType = iota
 
-	// EncodeSegwit denotes that the witness vector field is not be be
+	// EncodeSegwit denotes that the witness vector field is not to be
 	// encoded.
 	EncodeSegwit
 )