Add configuration section to CLI manual
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| The PVC CLI client is built with Click, a Python framework for creating self-documenting CLI applications. It interfaces directly with the Zookeeper cluster to send and receive information about the cluster with no authentication. | The PVC CLI client is built with Click, a Python framework for creating self-documenting CLI applications. It interfaces directly with the Zookeeper cluster to send and receive information about the cluster with no authentication. | ||||||
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| Use the `-h` option at any level of the `pvc` CLI command to receive help about the available commands and options. | Use the `-h` option at any level of the `pvc` CLI command to receive help about the available commands and options. | ||||||
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|  | ## Configuration | ||||||
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|  | The CLI client requires no configuration file. The only optional external environment variable is `PVC_ZOOKEEPER_HOST`, which accepts a Zookeeper connection string and replaces the argument `-z` to the CLI command. | ||||||
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