code: func BuildIdentityConfigFromOptions(opts ...interface{}) (msp.IdentityConfig, error) {
  	// build a new IdentityConfig with overridden function implementations
  	c := &IdentityConfigOptions{}
  	for _, option := range opts {
  		err := setIdentityConfigWithOptionInterface(c, option)
  		if err != nil {
  			return nil, err
  		}
  	}
  
  	return c, nil
  
  }
docs: // BuildIdentityConfigFromOptions will return an IdentityConfig instance pre-built with Optional interfaces
  // provided in fabsdk's WithConfigIdentity(opts...) call