Update index.md of 'Printing output' in NodeJs Roadmap (#5287)

* Update index.md of 'Printing output' in NodeJs Roadmap

Update index.md of 'Printing output' in NodeJs Roadmap

* Update src/data/roadmaps/nodejs/content/106-nodejs-command-line-apps/101-printing-output/index.md

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Co-authored-by: Kamran Ahmed <kamranahmed.se@gmail.com>

src/data/roadmaps/nodejs/content/106-nodejs-command-line-apps/101-printing-output/index.md

@@ -1 +1,3 @@
 # Printing output
+
+Printing output in Node.js command-line applications is a fundamental aspect of communicating with users and displaying information. You can print output using `process.stdout`, `process.stderr` or simple `console.*` functions.