[FLINK-18678][hive][doc] Update doc about setting hive version

[lirui-apache]

What is the purpose of the change

Update doc and suggest not to manually set Hive version for HiveCatalog. Strange errors can happen if user sets an incorrect version.

Brief change log

• Update doc

Verifying this change

NA

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

NA

Documentation

NA

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Last check on commit 47ecfdd (Fri Jul 24 12:56:00 UTC 2020)

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[lirui-apache]

@JingsongLi Please have a look.

[JingsongLi]

Thanks for contribution, you should modify https://ci.apache.org/projects/flink/flink-docs-master/dev/table/catalogs.html too

[lirui-apache]

@JingsongLi I have updated the catalogs page. Please have another look, thanks.

[JingsongLi]

Looks good to me.