Исправления документации на русском языке

[YuraPlinto]

Исправлены мелкие ошибки в документации на русском языке: неправильное использование единственного и множественного числа, отсутствующие запятые, противоречия по смыслу и т.д.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 64.94%. Comparing base (5abe83e) to head (29c1dfa). Report is 1 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #20249 +/- ## ========================================= Coverage 64.94% 64.94% Complexity 11394 11394 ========================================= Files 430 430 Lines 36920 36920 ========================================= Hits 23979 23979 Misses 12941 12941 ```

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[samdark]

:+1: