docs(packer): tighten packerInitSupportsTemplate comment

Author: james00012

modules/packer/packer.go

@@ -318,10 +318,8 @@ func packerInit(t testing.TestingT, ctx context.Context, options *Options) error
 	return err
 }
 
-// packerInitSupportsTemplate reports whether `packer init` applies to the configured template. init supports HCL2
-// templates, which can be either a single .hcl file (for example foo.pkr.hcl) or a directory holding HCL2 templates.
-// Legacy JSON templates are not supported. Template paths are resolved relative to WorkingDir, matching how packer is
-// invoked.
+// packerInitSupportsTemplate reports whether `packer init` applies to the template: an .hcl file or a directory of HCL2
+// templates, but not legacy JSON. The path is resolved relative to WorkingDir, matching how packer is invoked.
 func packerInitSupportsTemplate(options *Options) bool {
 	if filepath.Ext(options.Template) == ".hcl" {
 		return true