fix MaxCompletionTokens typo

[l-winston]

Currently API calls to o1 models are broken due to a typo in the json tag of ChatCompletionRequest

This PR corrects the spelling of MaxCompletionsTokens to MaxCompletionTokens and also fixes the json tag max_completion_tokens.

There already exists a similar PR but it doesn't fix all occurrences of the typo.

[codecov[bot]]

Codecov Report

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

Project coverage is 99.04%. Comparing base (774fc9d) to head (0d4db46). Report is 58 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #862 +/- ## ========================================== + Coverage 98.46% 99.04% +0.58% ========================================== Files 24 26 +2 Lines 1364 1461 +97 ========================================== + Hits 1343 1447 +104 + Misses 15 8 -7 Partials 6 6 ```

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[l-winston]

hey @sashabaranov could you take a look at this PR 😁

[sashabaranov]

Thank you, it seems like this is fixed in an earlier PR! #860

[l-winston]

@sashabaranov that PR did fix the json tag but leaves many typos, which I also fixed.

[sashabaranov]

Ah, got it, thanks!

[l-winston]

@sashabaranov fixed