"Backpressuring in Streams" doc: Update pipeline examples

[caarmen]

Description

In the "Backpressuring in Streams" documentation, update the pipeline() examples:

• Callback examples: Use the correct module (stream, not stream/promises).
• Promise examples: Use stream/promises instead of promisify.

Validation

The updated page, when built locally (npm run dev) is http://localhost:3000/en/learn/modules/backpressuring-in-streams#the-problem-with-data-handling

Updated doc screenshots (click images to see full size):

Section	CJS example	MJS example
callback
promise

Related Issues

Check List

• I have read the Contributing Guidelines and made commit messages that follow the guideline.
• I have run npm run format to ensure the code follows the style guide.
• I have run npm run test to check if all tests are passing.
• I have run npx turbo build to check if the website builds without errors.
• I've covered new added functionality with unit tests if necessary.

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Name	Status	Preview	Updated (UTC)
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[mikeesto]

LGTM, thanks for your contribution

[AugustinMauroy]

LGTM ! thank you for helping to keep these resources up to date.

[github-actions]

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[github-actions]

Unit Test Coverage Report

Unit Test Report

Tests	Skipped	Failures	Errors	Time
131	0 💤	0 ❌	0 🔥	5.344s ⏱️