[jira] [Created] (FLINK-4778) Update program example in /docs/setup/cli.md due to the change in FLINK-2021

[Shang Yuanchun (Jira)]

Pattarawat Chormai created FLINK-4778:
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             Summary: Update program example in /docs/setup/cli.md due to the change in FLINK-2021
                 Key: FLINK-4778
                 URL: https://issues.apache.org/jira/browse/FLINK-4778
             Project: Flink
          Issue Type: Task
            Reporter: Pattarawat Chormai
            Priority: Trivial


According to FLINK-2021, ParameterTool was introduced hence all input parameters need to send with its corresponding prefix such as **--input**, **--output**.

However, WordCount call in https://github.com/apache/flink/blob/master/docs/setup/cli.md#examples hasn't been updated yet.

REF: https://github.com/apache/flink/commit/0629e25602eefdc239e8e72d9e3c9c1a5164448e



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