[hotfix][tableApi] Fix the description information of intersect in tableApi docs

[maqingxiang]

No description provided.

[yanghua]

Thanks for your contribution @maqingxiang . LGTM

[fhueske]

Hi @maqingxiang, thanks for this PR.
The current documentation is correct.
For intersect / intersectAll, both input tables only need to have the same field types but the field names can differ. I'd like to keep the docs as they are to make this behavior clear.
Would you please close this PR?

Thank you, Fabian.

[yanghua]

@fhueske you are right.
But there may be some points that can be misleading for some users:

• Sometimes fields of the same name are more easily visually identified as having the same type;
• Multiple test methods in SetOperatorsITCase explicitly specify the same fields (a, b, c) for the left and right Tables, because the document is just an incomplete example, sometimes after the user views the document, they will try to search the source code and see real cases in the project;
• Other operators of multi-table operations in the same document such as union, minus also use the same field name

This is why I said LGTM. But in fact, for those who understand the use of this operator, it does not matter whether it is modified or not.

[fhueske]

Consistent documentation is a good point. However, I'd rather change the other examples than indicating a limitation that does not exist.

Regarding the tests, IMO the should not be considered as documentation.

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