[Doc] Description of the brokerAddrTable property in MQClientInstance

[luozongle01]

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Is the description of the key in the brokerAddrTable as "The key of the map is the brokerCluster name." somewhat ambiguous. Because brokerClusterName is generally understood as something similar to "DefaultCluster", should the description be modified to "The key of the map is the brokerName."

Are you willing to submit PR?

• Yes I am willing to submit a PR!