Update docstring of RpcConnection.from_addr constructor.

        :param addr: the target ip address

        :param port: the target port

        :param manager: manager of this connection

        :param enable_ssl: enable SSL

        :param cert: is SSL is enabled, profile the filename of certificate to

            check. If None, don't check certificate.

        :param *args: parameters to pass to the standard constructor

        :param **kwargs: keyword parameters to pass to the standard constructor

        :param handler: Handler to attach to this :class:`RpcConnection` object

        '''

        sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)