Fixed typo in gpt-5_prompting_guide.ipynb

[realabdulkhaliq]

• Replaced : with .
• Replaced ; with , and

This will improve understanding of text for readers.

Summary

Fixed minor typos and improved punctuation in the documentation:

Added a missing period to the sentence:
This reduces the model’s need to explore and reason about too many ideas:
to
This reduces the model’s need to explore and reason about too many ideas.

Improved clarity in the sentence:

"Deduplicate paths and cache; don’t repeat queries."
to
"Deduplicate paths and cache, and don’t repeat queries."

Motivation

This change improves the readability and professionalism of the text in the cookbook by correcting punctuation, ensuring it follows proper grammar rules. Clear, error-free documentation helps maintain a high-quality resource for readers.

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[realabdulkhaliq]

I have closed this pull request, so pull request #2060 should be merge.