Edit C++ functions file

[LesgoMega]

Description

• Added recursion subsection on functions.md file for C++
• Relates to issue 5486

Issue Solved

closes #5486

Type of Change

• Updating the documentation

Checklist

• All writings are my own.
• My entry follows the Codecademy Docs style guide.
• My changes generate no new warnings.
• I have performed a self-review of my own writing and code.
• I have checked my entry and corrected any misspellings.
• I have made corresponding changes to the documentation if needed.
• I have confirmed my changes are not being pushed from my forked main branch.
• I have confirmed that I'm pushing from a new branch named after the changes I'm making.
• I have linked any issues that are relevant to this PR in the Issues Solved section.

[CLAassistant]

All committers have signed the CLA.

[mamtawardhani]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.You have signed the CLA already but the status is still pending? Let us recheck it.

Hey @LesgoMega please sign the CLA

[LesgoMega]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.You have signed the CLA already but the status is still pending? Let us recheck it.

Hey @LesgoMega please sign the CLA

Good day, @mamtawardhani CLA has been signed. Thank you.

[mamtawardhani]

Thank you for contributing to Codecademy Docs @LesgoMega 😄

The entry looks good for a second round of review! 🚀

[Sriparno08]

Looks good, @LesgoMega!

[github-actions]

👋 @LesgoMega
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