[Term Entry] C++ Math Function: isgreaterequal()

[CadilheP]

Description

• Added the math fuction isgreaterequal() term for C++
• Closes issue [Term Entry] C++ Math-functions: isgreaterequal() #7993

Issue Solved

Type of Change

• Adding a new entry

Checklist

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

[CLAassistant]

All committers have signed the CLA.

[mamtawardhani]

Looks good for a second review! 🚀

[CadilheP]

This review includes the suggested refinements