Update gen templates for license/gen info (#3211)

internal/api/genapi/templates.go

@@ -589,6 +589,9 @@ var structTemplate = template.Must(template.New("").Funcs(
 	},
 ).Parse(
 	fmt.Sprint(`// Code generated by "make api"; DO NOT EDIT.
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package {{ .Package }}
 
 import (
@@ -683,7 +686,7 @@ var optionTemplate = template.Must(template.New("").Funcs(
 		"makeSlice":  makeSlice,
 		"removeDups": removeDups,
 	},
-).Parse(`
+).Parse(`// Code generated by "make api"; DO NOT EDIT.
 // Copyright (c) HashiCorp, Inc.
 // SPDX-License-Identifier: MPL-2.0