[hotfix][table][docs] correct distinct operator doc for table API.

[sunjincheng121]

What is the purpose of the change

In this JIRA only correct distinct operator doc for table API.

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This change does not need any test coverage.

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• Dependencies (does it add or upgrade a dependency): ( no)
• The public API, i.e., is any changed class annotated with @Public(Evolving): (no)
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Documentation

• Does this pull request introduce a new feature? ( no)
• If yes, how is the feature documented? (docs )

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[hequn8128]

@sunjincheng121 Thanks for fixing the document and improving the docs about result updating.
+1 to merge once the travis turns gree.

Best, Hequn

[sunjincheng121]

@flinkbot approve all
Merging