docs: func (s *UpdateCertificateAuthorityInput) Validate() error {
  	invalidParams := request.ErrInvalidParams{Context: "UpdateCertificateAuthorityInput"}
  	if s.CertificateAuthorityArn == nil {
  		invalidParams.Add(request.NewErrParamRequired("CertificateAuthorityArn"))
  	}
  	if s.CertificateAuthorityArn != nil && len(*s.CertificateAuthorityArn) < 5 {
  		invalidParams.Add(request.NewErrParamMinLen("CertificateAuthorityArn", 5))
  	}
  	if s.RevocationConfiguration != nil {
  		if err := s.RevocationConfiguration.Validate(); err != nil {
  			invalidParams.AddNested("RevocationConfiguration", err.(request.ErrInvalidParams))
  		}
  	}
  
  	if invalidParams.Len() > 0 {
  		return invalidParams
  	}
  	return nil
  }