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PR from branch users/alexdrydew/add_kw_only_to_doc
updated md added function signatures to doc **** ![review](https://codereview.in.yandex-team.ru/badges/review-complete-green.svg) [![losev](https://codereview.in.yandex-team.ru/badges/losev-...-yellow.svg)](https://staff.yandex-team.ru/losev) [![sinosov](https://codereview.in.yandex-team.ru/badges/sinosov-ok-green.svg)](https://staff.yandex-team.ru/sinosov) ref:1b6b2854b04ff69ca3dc56f719a3a4b0e228f60c
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