[doc] Fix typos

[gleb7499]

Fixes #786.

[codecov[bot]]

Codecov Report

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

Project coverage is 40.28%. Comparing base (0f8b5c2) to head (101bcc0). Report is 2 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #787 +/- ## ======================================= Coverage 40.28% 40.28% ======================================= Files 69 69 Lines 26193 26193 Branches 3264 3264 ======================================= Hits 10551 10551 Misses 15642 15642 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.

[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud