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

internal/cmd/gencli/templates.go

@@ -84,6 +84,9 @@ var cmdTemplate = template.Must(template.New("").Funcs(
 	},
 ).Parse(`{{ $input := . }}
 // Code generated by "make cli"; DO NOT EDIT.
+// Copyright (c) HashiCorp, Inc.
+// SPDX-License-Identifier: MPL-2.0
+
 package {{ .Pkg }}cmd
 
 import (