docs: fix typos in tool calls stream example

[Rohan5commit]

Summary

• fix two typo-only comments in the tool-calls-stream example

Related issue

• N/A (trivial example comment fix)

Guideline alignment

• Reviewed https://github.com/openai/openai-node/blob/master/CONTRIBUTING.md and kept the change in the hand-maintained examples/ directory.

Validation/testing note

• Not run (example comment-only change)

[Copilot]

Pull request overview

Fixes minor spelling/grammar issues in the tool-calls-stream TypeScript example comments to improve readability in the hand-maintained examples/ directory.

Changes:

• Corrects “Used so that the each chunk coming in is noticable” → “Used so that each chunk coming in is noticeable”
• Corrects “noticablej” typo in the chunk-delay comment

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