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

[CadilheP]

Description

• Added the math fuction isgreaterequal() term for C++
• Closes issue #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.

[CadilheP]

Sorry I'm new doing this. Is anything missing to merge this pull request? If so, could you please be so kind and guide me through the next steps. Many thanks in advance for your support.