code: func (c *IdentityConfig) CAConfig(org string) (*msp.CAConfig, bool) {
  	caConfigs, ok := c.caConfigsByOrg[strings.ToLower(org)]
  	if ok {
  		//for now, we're only loading the first Cert Authority by default.
  		return caConfigs[0], true
  	}
  	return nil, false
  }
docs: // CAConfig returns the CA configuration.