[FLINK-20372] Update Kafka SQL connector page to mention properties.*…

[fsk119]

… options

What is the purpose of the change

Add document to use properies to pass kafka config.

Brief change log

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Last check on commit 1597ca9 (Tue Dec 01 13:01:49 UTC 2020)

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[fsk119]

The current page looks:

[wuchong]

LGTM.