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Description
Firstly, example Simple was reworked, so this section is not actual (several doclabels were deleted), we need to fix it.
Secondly, we have a couple of new examples. Example Sql shows how to use SQL queries in tntcxx, and Schemaless demonstrates a way to work with schema-less tuples. We shouldn't add them to the getting started page - it would be overwhelming, but, probably, we should create a separate section for tntcxx examples.