fix(learn): improve 'Understanding process.nextTick()' doc page example code. #7679
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Description
The 'Understanding process.nextTick()' doc have one messy example code and example ouput caused by setImmediate() vs setTimeout(). Example code in that doc saying that setImmediate will always have higher order been executed, which may confused for the readers
Validation
The example code has been reviewed to correctly reflect the behavior of the executed order for both setImmediate and setTimeout.
Reviewers should verify that the updated explanation is both technically correct and clearly communicates. No functional or visual changes—only documentation improvements.
Related Issues
Fixes nodejs/node#58000
Check List
npm run formatto ensure the code follows the style guide.npm run testto check if all tests are passing.npx turbo buildto check if the website builds without errors.