[BUG] Corrected the description of the MWorker constructor

[sunxingboo]

Current

def __init__(self, opts, mkey, key, req_channels, **kwargs):
        """
        Create a salt master worker process

        :param dict opts: The salt options
        :param dict mkey: The user running the salt master and the **AES key**
        :param dict key: The user running the salt master and the **RSA key**

Expect

def __init__(self, opts, mkey, key, req_channels, **kwargs):
        """
        Create a salt master worker process

        :param dict opts: The salt options
        :param dict mkey: The user running the salt master and the **RSA key**
        :param dict key: The user running the salt master and the **AES key**

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