[TD-3229] <docs>: remove link to empty docs.

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update index.md

update title of cluster.md

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update administrator.md

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Add files via upload

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update connector.md

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add 03.architecture

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Docs/update latest feature

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[TD-4473] update alter keep test

Test/td 4526

test session on second timestamp fields

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[TD-4669] <docs>: upload English documents & pictures for version 2.0.