code: def update(self, friendly_name=values.unset):
          
          data = values.of({'FriendlyName': friendly_name, })
  
          payload = self._version.update(
              'POST',
              self._uri,
              data=data,
          )
  
          return SigningKeyInstance(
              self._version,
              payload,
              account_sid=self._solution['account_sid'],
              sid=self._solution['sid'],
          )
docs: Update the SigningKeyInstance
  
          :param unicode friendly_name: The friendly_name
  
          :returns: Updated SigningKeyInstance
          :rtype: twilio.rest.api.v2010.account.signing_key.SigningKeyInstance