[Doc] correct schema in example batch jsonl file: max_completion_tokens -> max_tokens

[staeiou]

[Doc]: batch example file has outdated parameters

FIX #9969 (link existing issues this PR will resolve)

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[gcalmettes]

Hi @staeiou ,

max_tokens is actually deprecated in the openAI API in favor of the new max_completion_tokens field (see the official specifications.

The code in main supports both max_tokens and max_completion_tokens but there hasn't yet been an official release shipping it. The examples have been bumped to use the new max_completion_tokens field and that requires indeed to have a server running with the latest code to not have an error.

See #9970 (comment)