Update explanation on reading files with streams

[arizzaa13]

Clarify that using streams for reading files is more memory efficient.

[vercel]

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Project	Deployment	Actions	Updated (UTC)
nodejs-learn	Ready	Preview	May 3, 2026 7:48am

[cursor]

PR Summary

Low Risk
Low risk documentation-only change that slightly adjusts wording without impacting any runtime code.

Overview
Clarifies the guidance in pages/manipulating-files/reading-files-with-nodejs.md to explicitly state that using streams to read large files is more memory efficient than fs.readFile* methods that load the entire file into memory.

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