"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

• [x] I have read the Contributing Guidelines and made commit messages that follow the guideline.
• [x] I have run npm run format to ensure the code follows the style guide.
• [x] I have run npm run test to check if all tests are passing.
• [x] 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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Unit Test Coverage Report

Unit Test Report

Tests	Skipped	Failures	Errors	Time
131	0 :zzz:	0 :x:	0 :fire:	5.344s :stopwatch: