docs: fix 7 typos in comments and documentation

[Avicennasis]

Summary

Fix 7 typos across 3 files.

integrations/model-training/fastai/notebooks/fastai_hello_world.ipynb

• the the MNIST_TINY → the MNIST_TINY
• fit_one_cylce → fit_one_cycle
• Finall, we are ready → Finally, we are ready
• do this is a script → do this in a script

integrations/model-training/keras/notebooks/Comet_with_Keras.ipynb

• This will logs the notebook → This will log the notebook

integrations/llm/openai/notebooks/Comet_and_OpenAI.ipynb

• Comet fully support OpenAI Vision → Comet fully supports OpenAI Vision
• [checkout this notebook] → [check out this notebook]

Comments and documentation only — no functional changes.