[FLINK-18644][doc][hive] Remove obsolete hive connector docs

[lirui-apache]

What is the purpose of the change

Remove some obsolete doc of hive connector.

Brief change log

• Update doc

Verifying this change

N/A

Does this pull request potentially affect one of the following parts:

N/A

Documentation

N/A

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Last check on commit fbcb36d (Mon Jul 20 13:17:54 UTC 2020)

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CI report:

• fbcb36d Azure: SUCCESS

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[JingsongLi]

Looks good to me.