docs: func s3CustRemoveHeadObjectModeledErrors(a *API) {
  	op, ok := a.Operations["HeadObject"]
  	if !ok {
  		return
  	}
  	op.Documentation += `
  //
  // See http://docs.aws.amazon.com/AmazonS3/latest/API/ErrorResponses.html#RESTErrorResponses
  // for more information on returned errors.`
  	op.ErrorRefs = []ShapeRef{}
  }