Update mapstructure-to-hcl2.go

better comments

cmd/mapstructure-to-hcl2/mapstructure-to-hcl2.go

@@ -1,24 +1,24 @@
 // mapstructure-to-hcl2 fills the gaps between hcl2 and mapstructure for Packer
-
+//
 // By generating a struct that the HCL2 ecosystem understands making use of
 // mapstructure tags.
-
+//
 // Packer heavily uses the mapstructure decoding library to load/parse user
 // config files. Packer now needs to move to HCL2.
-
+//
 // Here are a few differences/gaps betweens hcl2 and mapstructure:
-
+//
 //  * in HCL2 all basic struct fields (string/int/struct) that are not pointers
 //   are required ( must be set ). In mapstructure everything is optional.
-
+//
 //  * mapstructure allows to 'squash' fields
 //  (ex: Field CommonStructType `mapstructure:",squash"`) this allows to
 //  decorate structs and reuse configuration code. HCL2 parsing libs don't have
 //  anything similar.
-
+//
 // mapstructure-to-hcl2 will parse Packer's config files and generate the HCL2
 // compliant code that will allow to not change any of the current builders in
-// order to move to HCL2 to softly move to HCL2.
+// order to softly move to HCL2.
 package main
 
 import (