code: func EnsureSpelling() error {
  	goSpelling := func() error {
  		return goSourceApply("misspell", "-error")
  	}
  	mg.SerialDeps(
  		goSpelling,
  		EnsureMarkdownSpelling)
  	return nil
  }
docs: // EnsureSpelling ensures that there are no misspellings in the source