Fix typo: necesary → necessary

[Arthi706]

No description provided.

[Arthi706]

I investigated the CI failure in IdeficsProcessorTest::test_save_load_pretrained_additional_features

The test passes locally:

pytest tests/models/idefics/test_processing_idefics.py -k test_save_load_pretrained_additional_features

This PR only updates comments/docstrings, so the CI failure appears unrelated/flaky.
Happy to rerun CI if needed.

[Rocketknight1]

Yep, thanks for the fix!

[github-actions]

View the CircleCI Test Summary for this PR:

https://huggingface.co/spaces/transformers-community/circle-ci-viz?pr=43271&sha=f314a9

[HuggingFaceDocBuilderDev]

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[Rocketknight1]

cc @ydshieh we definitely have some flaky tests here! Some of them look like Hub connection issues but I think we probably want to mark test_prompt_lookup_decoding_matches_greedy_search as flaky?